refactor(ci): extract fast checkout action

.github/actions/checkout-ci-fast/action.yml

@@ -0,0 +1,79 @@
+name: Fast CI checkout
+description: >
+  Perform a shallow detached checkout with timeout/retry behavior tuned for the
+  Linux CI lanes that have seen intermittent actions/checkout stalls.
+inputs:
+  repo:
+    description: Repository in owner/name form.
+    required: true
+  sha:
+    description: Commit SHA to fetch and checkout.
+    required: true
+  token:
+    description: GitHub token used for authenticated fetches.
+    required: true
+  fetch-depth:
+    description: Depth to fetch from origin.
+    required: false
+    default: "1"
+  fetch-timeout-seconds:
+    description: Per-attempt fetch timeout in seconds.
+    required: false
+    default: "30"
+  attempts:
+    description: Number of checkout attempts before failing.
+    required: false
+    default: "2"
+runs:
+  using: composite
+  steps:
+    - name: Fast checkout
+      shell: bash
+      env:
+        CHECKOUT_REPO: ${{ inputs.repo }}
+        CHECKOUT_SHA: ${{ inputs.sha }}
+        CHECKOUT_TOKEN: ${{ inputs.token }}
+        CHECKOUT_FETCH_DEPTH: ${{ inputs.fetch-depth }}
+        CHECKOUT_FETCH_TIMEOUT_SECONDS: ${{ inputs.fetch-timeout-seconds }}
+        CHECKOUT_ATTEMPTS: ${{ inputs.attempts }}
+      run: |
+        set -euo pipefail
+
+        workdir="$GITHUB_WORKSPACE"
+        auth_header="$(printf 'x-access-token:%s' "$CHECKOUT_TOKEN" | base64 | tr -d '\n')"
+
+        reset_checkout_dir() {
+          mkdir -p "$workdir"
+          find "$workdir" -mindepth 1 -maxdepth 1 -exec rm -rf {} +
+        }
+
+        checkout_attempt() {
+          local attempt="$1"
+
+          reset_checkout_dir
+          git init "$workdir" >/dev/null
+          git config --global --add safe.directory "$workdir"
+          git -C "$workdir" remote add origin "https://github.com/${CHECKOUT_REPO}"
+          git -C "$workdir" config gc.auto 0
+
+          timeout --signal=TERM "${CHECKOUT_FETCH_TIMEOUT_SECONDS}s" git -C "$workdir" \
+            -c protocol.version=2 \
+            -c "http.https://github.com/.extraheader=AUTHORIZATION: basic ${auth_header}" \
+            fetch --no-tags --prune --no-recurse-submodules --depth="${CHECKOUT_FETCH_DEPTH}" origin \
+            "+${CHECKOUT_SHA}:refs/remotes/origin/ci-target" || return 1
+
+          git -C "$workdir" checkout --force --detach "$CHECKOUT_SHA" || return 1
+          test -f "$workdir/.github/actions/setup-node-env/action.yml" || return 1
+          echo "checkout attempt ${attempt}/${CHECKOUT_ATTEMPTS} succeeded"
+        }
+
+        for attempt in $(seq 1 "$CHECKOUT_ATTEMPTS"); do
+          if checkout_attempt "$attempt"; then
+            exit 0
+          fi
+          echo "checkout attempt ${attempt}/${CHECKOUT_ATTEMPTS} failed"
+          sleep $((attempt * 5))
+        done
+
+        echo "checkout failed after ${CHECKOUT_ATTEMPTS} attempts" >&2
+        exit 1

.github/workflows/ci.yml

@@ -408,52 +408,11 @@ jobs:
     timeout-minutes: 20
     steps:
       - name: Checkout
-        shell: bash
-        env:
-          CHECKOUT_REPO: ${{ github.repository }}
-          CHECKOUT_SHA: ${{ github.sha }}
-          CHECKOUT_TOKEN: ${{ github.token }}
-        run: |
-          set -euo pipefail
-
-          workdir="$GITHUB_WORKSPACE"
-          auth_header="$(printf 'x-access-token:%s' "$CHECKOUT_TOKEN" | base64 | tr -d '\n')"
-
-          reset_checkout_dir() {
-            mkdir -p "$workdir"
-            find "$workdir" -mindepth 1 -maxdepth 1 -exec rm -rf {} +
-          }
-
-          checkout_attempt() {
-            local attempt="$1"
-
-            reset_checkout_dir
-            git init "$workdir" >/dev/null
-            git config --global --add safe.directory "$workdir"
-            git -C "$workdir" remote add origin "https://github.com/${CHECKOUT_REPO}"
-            git -C "$workdir" config gc.auto 0
-
-            timeout --signal=TERM 30s git -C "$workdir" \
-              -c protocol.version=2 \
-              -c "http.https://github.com/.extraheader=AUTHORIZATION: basic ${auth_header}" \
-              fetch --no-tags --prune --no-recurse-submodules --depth=1 origin \
-              "+${CHECKOUT_SHA}:refs/remotes/origin/ci-target" || return 1
-
-            git -C "$workdir" checkout --force --detach "$CHECKOUT_SHA" || return 1
-            test -f "$workdir/.github/actions/setup-node-env/action.yml" || return 1
-            echo "checkout attempt ${attempt}/2 succeeded"
-          }
-
-          for attempt in 1 2; do
-            if checkout_attempt "$attempt"; then
-              exit 0
-            fi
-            echo "checkout attempt ${attempt}/2 failed"
-            sleep $((attempt * 5))
-          done
-
-          echo "checkout failed after 2 attempts" >&2
-          exit 1
+        uses: ./.github/actions/checkout-ci-fast
+        with:
+          repo: ${{ github.repository }}
+          sha: ${{ github.sha }}
+          token: ${{ github.token }}
 
       - name: Ensure secrets base commit (PR fast path)
         if: github.event_name == 'pull_request'
@@ -509,52 +468,11 @@ jobs:
       matrix: ${{ fromJson(needs.preflight.outputs.checks_fast_core_matrix) }}
     steps:
       - name: Checkout
-        shell: bash
-        env:
-          CHECKOUT_REPO: ${{ github.repository }}
-          CHECKOUT_SHA: ${{ github.sha }}
-          CHECKOUT_TOKEN: ${{ github.token }}
-        run: |
-          set -euo pipefail
-
-          workdir="$GITHUB_WORKSPACE"
-          auth_header="$(printf 'x-access-token:%s' "$CHECKOUT_TOKEN" | base64 | tr -d '\n')"
-
-          reset_checkout_dir() {
-            mkdir -p "$workdir"
-            find "$workdir" -mindepth 1 -maxdepth 1 -exec rm -rf {} +
-          }
-
-          checkout_attempt() {
-            local attempt="$1"
-
-            reset_checkout_dir
-            git init "$workdir" >/dev/null
-            git config --global --add safe.directory "$workdir"
-            git -C "$workdir" remote add origin "https://github.com/${CHECKOUT_REPO}"
-            git -C "$workdir" config gc.auto 0
-
-            timeout --signal=TERM 30s git -C "$workdir" \
-              -c protocol.version=2 \
-              -c "http.https://github.com/.extraheader=AUTHORIZATION: basic ${auth_header}" \
-              fetch --no-tags --prune --no-recurse-submodules --depth=1 origin \
-              "+${CHECKOUT_SHA}:refs/remotes/origin/ci-target" || return 1
-
-            git -C "$workdir" checkout --force --detach "$CHECKOUT_SHA" || return 1
-            test -f "$workdir/.github/actions/setup-node-env/action.yml" || return 1
-            echo "checkout attempt ${attempt}/2 succeeded"
-          }
-
-          for attempt in 1 2; do
-            if checkout_attempt "$attempt"; then
-              exit 0
-            fi
-            echo "checkout attempt ${attempt}/2 failed"
-            sleep $((attempt * 5))
-          done
-
-          echo "checkout failed after 2 attempts" >&2
-          exit 1
+        uses: ./.github/actions/checkout-ci-fast
+        with:
+          repo: ${{ github.repository }}
+          sha: ${{ github.sha }}
+          token: ${{ github.token }}
 
       - name: Setup Node environment
         uses: ./.github/actions/setup-node-env
@@ -592,52 +510,11 @@ jobs:
     timeout-minutes: 30
     steps:
       - name: Checkout
-        shell: bash
-        env:
-          CHECKOUT_REPO: ${{ github.repository }}
-          CHECKOUT_SHA: ${{ github.sha }}
-          CHECKOUT_TOKEN: ${{ github.token }}
-        run: |
-          set -euo pipefail
-
-          workdir="$GITHUB_WORKSPACE"
-          auth_header="$(printf 'x-access-token:%s' "$CHECKOUT_TOKEN" | base64 | tr -d '\n')"
-
-          reset_checkout_dir() {
-            mkdir -p "$workdir"
-            find "$workdir" -mindepth 1 -maxdepth 1 -exec rm -rf {} +
-          }
-
-          checkout_attempt() {
-            local attempt="$1"
-
-            reset_checkout_dir
-            git init "$workdir" >/dev/null
-            git config --global --add safe.directory "$workdir"
-            git -C "$workdir" remote add origin "https://github.com/${CHECKOUT_REPO}"
-            git -C "$workdir" config gc.auto 0
-
-            timeout --signal=TERM 30s git -C "$workdir" \
-              -c protocol.version=2 \
-              -c "http.https://github.com/.extraheader=AUTHORIZATION: basic ${auth_header}" \
-              fetch --no-tags --prune --no-recurse-submodules --depth=1 origin \
-              "+${CHECKOUT_SHA}:refs/remotes/origin/ci-target" || return 1
-
-            git -C "$workdir" checkout --force --detach "$CHECKOUT_SHA" || return 1
-            test -f "$workdir/.github/actions/setup-node-env/action.yml" || return 1
-            echo "checkout attempt ${attempt}/2 succeeded"
-          }
-
-          for attempt in 1 2; do
-            if checkout_attempt "$attempt"; then
-              exit 0
-            fi
-            echo "checkout attempt ${attempt}/2 failed"
-            sleep $((attempt * 5))
-          done
-
-          echo "checkout failed after 2 attempts" >&2
-          exit 1
+        uses: ./.github/actions/checkout-ci-fast
+        with:
+          repo: ${{ github.repository }}
+          sha: ${{ github.sha }}
+          token: ${{ github.token }}
 
       - name: Setup Node environment
         uses: ./.github/actions/setup-node-env
@@ -661,52 +538,11 @@ jobs:
       matrix: ${{ fromJson(needs.preflight.outputs.checks_node_extensions_matrix) }}
     steps:
       - name: Checkout
-        shell: bash
-        env:
-          CHECKOUT_REPO: ${{ github.repository }}
-          CHECKOUT_SHA: ${{ github.sha }}
-          CHECKOUT_TOKEN: ${{ github.token }}
-        run: |
-          set -euo pipefail
-
-          workdir="$GITHUB_WORKSPACE"
-          auth_header="$(printf 'x-access-token:%s' "$CHECKOUT_TOKEN" | base64 | tr -d '\n')"
-
-          reset_checkout_dir() {
-            mkdir -p "$workdir"
-            find "$workdir" -mindepth 1 -maxdepth 1 -exec rm -rf {} +
-          }
-
-          checkout_attempt() {
-            local attempt="$1"
-
-            reset_checkout_dir
-            git init "$workdir" >/dev/null
-            git config --global --add safe.directory "$workdir"
-            git -C "$workdir" remote add origin "https://github.com/${CHECKOUT_REPO}"
-            git -C "$workdir" config gc.auto 0
-
-            timeout --signal=TERM 30s git -C "$workdir" \
-              -c protocol.version=2 \
-              -c "http.https://github.com/.extraheader=AUTHORIZATION: basic ${auth_header}" \
-              fetch --no-tags --prune --no-recurse-submodules --depth=1 origin \
-              "+${CHECKOUT_SHA}:refs/remotes/origin/ci-target" || return 1
-
-            git -C "$workdir" checkout --force --detach "$CHECKOUT_SHA" || return 1
-            test -f "$workdir/.github/actions/setup-node-env/action.yml" || return 1
-            echo "checkout attempt ${attempt}/2 succeeded"
-          }
-
-          for attempt in 1 2; do
-            if checkout_attempt "$attempt"; then
-              exit 0
-            fi
-            echo "checkout attempt ${attempt}/2 failed"
-            sleep $((attempt * 5))
-          done
-
-          echo "checkout failed after 2 attempts" >&2
-          exit 1
+        uses: ./.github/actions/checkout-ci-fast
+        with:
+          repo: ${{ github.repository }}
+          sha: ${{ github.sha }}
+          token: ${{ github.token }}
 
       - name: Setup Node environment
         uses: ./.github/actions/setup-node-env
@@ -755,52 +591,11 @@ jobs:
 
       - name: Checkout
         if: github.event_name != 'pull_request' || matrix.task != 'compat-node22'
-        shell: bash
-        env:
-          CHECKOUT_REPO: ${{ github.repository }}
-          CHECKOUT_SHA: ${{ github.sha }}
-          CHECKOUT_TOKEN: ${{ github.token }}
-        run: |
-          set -euo pipefail
-
-          workdir="$GITHUB_WORKSPACE"
-          auth_header="$(printf 'x-access-token:%s' "$CHECKOUT_TOKEN" | base64 | tr -d '\n')"
-
-          reset_checkout_dir() {
-            mkdir -p "$workdir"
-            find "$workdir" -mindepth 1 -maxdepth 1 -exec rm -rf {} +
-          }
-
-          checkout_attempt() {
-            local attempt="$1"
-
-            reset_checkout_dir
-            git init "$workdir" >/dev/null
-            git config --global --add safe.directory "$workdir"
-            git -C "$workdir" remote add origin "https://github.com/${CHECKOUT_REPO}"
-            git -C "$workdir" config gc.auto 0
-
-            timeout --signal=TERM 30s git -C "$workdir" \
-              -c protocol.version=2 \
-              -c "http.https://github.com/.extraheader=AUTHORIZATION: basic ${auth_header}" \
-              fetch --no-tags --prune --no-recurse-submodules --depth=1 origin \
-              "+${CHECKOUT_SHA}:refs/remotes/origin/ci-target" || return 1
-
-            git -C "$workdir" checkout --force --detach "$CHECKOUT_SHA" || return 1
-            test -f "$workdir/.github/actions/setup-node-env/action.yml" || return 1
-            echo "checkout attempt ${attempt}/2 succeeded"
-          }
-
-          for attempt in 1 2; do
-            if checkout_attempt "$attempt"; then
-              exit 0
-            fi
-            echo "checkout attempt ${attempt}/2 failed"
-            sleep $((attempt * 5))
-          done
-
-          echo "checkout failed after 2 attempts" >&2
-          exit 1
+        uses: ./.github/actions/checkout-ci-fast
+        with:
+          repo: ${{ github.repository }}
+          sha: ${{ github.sha }}
+          token: ${{ github.token }}
 
       - name: Setup Node environment
         if: github.event_name != 'pull_request' || matrix.task != 'compat-node22'
@@ -880,52 +675,11 @@ jobs:
       matrix: ${{ fromJson(needs.preflight.outputs.checks_node_core_test_matrix) }}
     steps:
       - name: Checkout
-        shell: bash
-        env:
-          CHECKOUT_REPO: ${{ github.repository }}
-          CHECKOUT_SHA: ${{ github.sha }}
-          CHECKOUT_TOKEN: ${{ github.token }}
-        run: |
-          set -euo pipefail
-
-          workdir="$GITHUB_WORKSPACE"
-          auth_header="$(printf 'x-access-token:%s' "$CHECKOUT_TOKEN" | base64 | tr -d '\n')"
-
-          reset_checkout_dir() {
-            mkdir -p "$workdir"
-            find "$workdir" -mindepth 1 -maxdepth 1 -exec rm -rf {} +
-          }
-
-          checkout_attempt() {
-            local attempt="$1"
-
-            reset_checkout_dir
-            git init "$workdir" >/dev/null
-            git config --global --add safe.directory "$workdir"
-            git -C "$workdir" remote add origin "https://github.com/${CHECKOUT_REPO}"
-            git -C "$workdir" config gc.auto 0
-
-            timeout --signal=TERM 30s git -C "$workdir" \
-              -c protocol.version=2 \
-              -c "http.https://github.com/.extraheader=AUTHORIZATION: basic ${auth_header}" \
-              fetch --no-tags --prune --no-recurse-submodules --depth=1 origin \
-              "+${CHECKOUT_SHA}:refs/remotes/origin/ci-target" || return 1
-
-            git -C "$workdir" checkout --force --detach "$CHECKOUT_SHA" || return 1
-            test -f "$workdir/.github/actions/setup-node-env/action.yml" || return 1
-            echo "checkout attempt ${attempt}/2 succeeded"
-          }
-
-          for attempt in 1 2; do
-            if checkout_attempt "$attempt"; then
-              exit 0
-            fi
-            echo "checkout attempt ${attempt}/2 failed"
-            sleep $((attempt * 5))
-          done
-
-          echo "checkout failed after 2 attempts" >&2
-          exit 1
+        uses: ./.github/actions/checkout-ci-fast
+        with:
+          repo: ${{ github.repository }}
+          sha: ${{ github.sha }}
+          token: ${{ github.token }}
 
       - name: Setup Node environment
         uses: ./.github/actions/setup-node-env
@@ -1031,52 +785,11 @@ jobs:
       matrix: ${{ fromJson(needs.preflight.outputs.extension_fast_matrix) }}
     steps:
       - name: Checkout
-        shell: bash
-        env:
-          CHECKOUT_REPO: ${{ github.repository }}
-          CHECKOUT_SHA: ${{ github.sha }}
-          CHECKOUT_TOKEN: ${{ github.token }}
-        run: |
-          set -euo pipefail
-
-          workdir="$GITHUB_WORKSPACE"
-          auth_header="$(printf 'x-access-token:%s' "$CHECKOUT_TOKEN" | base64 | tr -d '\n')"
-
-          reset_checkout_dir() {
-            mkdir -p "$workdir"
-            find "$workdir" -mindepth 1 -maxdepth 1 -exec rm -rf {} +
-          }
-
-          checkout_attempt() {
-            local attempt="$1"
-
-            reset_checkout_dir
-            git init "$workdir" >/dev/null
-            git config --global --add safe.directory "$workdir"
-            git -C "$workdir" remote add origin "https://github.com/${CHECKOUT_REPO}"
-            git -C "$workdir" config gc.auto 0
-
-            timeout --signal=TERM 30s git -C "$workdir" \
-              -c protocol.version=2 \
-              -c "http.https://github.com/.extraheader=AUTHORIZATION: basic ${auth_header}" \
-              fetch --no-tags --prune --no-recurse-submodules --depth=1 origin \
-              "+${CHECKOUT_SHA}:refs/remotes/origin/ci-target" || return 1
-
-            git -C "$workdir" checkout --force --detach "$CHECKOUT_SHA" || return 1
-            test -f "$workdir/.github/actions/setup-node-env/action.yml" || return 1
-            echo "checkout attempt ${attempt}/2 succeeded"
-          }
-
-          for attempt in 1 2; do
-            if checkout_attempt "$attempt"; then
-              exit 0
-            fi
-            echo "checkout attempt ${attempt}/2 failed"
-            sleep $((attempt * 5))
-          done
-
-          echo "checkout failed after 2 attempts" >&2
-          exit 1
+        uses: ./.github/actions/checkout-ci-fast
+        with:
+          repo: ${{ github.repository }}
+          sha: ${{ github.sha }}
+          token: ${{ github.token }}
 
       - name: Setup Node environment
         uses: ./.github/actions/setup-node-env
@@ -1100,52 +813,11 @@ jobs:
     timeout-minutes: 20
     steps:
       - name: Checkout
-        shell: bash
-        env:
-          CHECKOUT_REPO: ${{ github.repository }}
-          CHECKOUT_SHA: ${{ github.sha }}
-          CHECKOUT_TOKEN: ${{ github.token }}
-        run: |
-          set -euo pipefail
-
-          workdir="$GITHUB_WORKSPACE"
-          auth_header="$(printf 'x-access-token:%s' "$CHECKOUT_TOKEN" | base64 | tr -d '\n')"
-
-          reset_checkout_dir() {
-            mkdir -p "$workdir"
-            find "$workdir" -mindepth 1 -maxdepth 1 -exec rm -rf {} +
-          }
-
-          checkout_attempt() {
-            local attempt="$1"
-
-            reset_checkout_dir
-            git init "$workdir" >/dev/null
-            git config --global --add safe.directory "$workdir"
-            git -C "$workdir" remote add origin "https://github.com/${CHECKOUT_REPO}"
-            git -C "$workdir" config gc.auto 0
-
-            timeout --signal=TERM 30s git -C "$workdir" \
-              -c protocol.version=2 \
-              -c "http.https://github.com/.extraheader=AUTHORIZATION: basic ${auth_header}" \
-              fetch --no-tags --prune --no-recurse-submodules --depth=1 origin \
-              "+${CHECKOUT_SHA}:refs/remotes/origin/ci-target" || return 1
-
-            git -C "$workdir" checkout --force --detach "$CHECKOUT_SHA" || return 1
-            test -f "$workdir/.github/actions/setup-node-env/action.yml" || return 1
-            echo "checkout attempt ${attempt}/2 succeeded"
-          }
-
-          for attempt in 1 2; do
-            if checkout_attempt "$attempt"; then
-              exit 0
-            fi
-            echo "checkout attempt ${attempt}/2 failed"
-            sleep $((attempt * 5))
-          done
-
-          echo "checkout failed after 2 attempts" >&2
-          exit 1
+        uses: ./.github/actions/checkout-ci-fast
+        with:
+          repo: ${{ github.repository }}
+          sha: ${{ github.sha }}
+          token: ${{ github.token }}
 
       - name: Setup Node environment
         uses: ./.github/actions/setup-node-env
@@ -1181,52 +853,11 @@ jobs:
             group: runtime-topology
     steps:
       - name: Checkout
-        shell: bash
-        env:
-          CHECKOUT_REPO: ${{ github.repository }}
-          CHECKOUT_SHA: ${{ github.sha }}
-          CHECKOUT_TOKEN: ${{ github.token }}
-        run: |
-          set -euo pipefail
-
-          workdir="$GITHUB_WORKSPACE"
-          auth_header="$(printf 'x-access-token:%s' "$CHECKOUT_TOKEN" | base64 | tr -d '\n')"
-
-          reset_checkout_dir() {
-            mkdir -p "$workdir"
-            find "$workdir" -mindepth 1 -maxdepth 1 -exec rm -rf {} +
-          }
-
-          checkout_attempt() {
-            local attempt="$1"
-
-            reset_checkout_dir
-            git init "$workdir" >/dev/null
-            git config --global --add safe.directory "$workdir"
-            git -C "$workdir" remote add origin "https://github.com/${CHECKOUT_REPO}"
-            git -C "$workdir" config gc.auto 0
-
-            timeout --signal=TERM 30s git -C "$workdir" \
-              -c protocol.version=2 \
-              -c "http.https://github.com/.extraheader=AUTHORIZATION: basic ${auth_header}" \
-              fetch --no-tags --prune --no-recurse-submodules --depth=1 origin \
-              "+${CHECKOUT_SHA}:refs/remotes/origin/ci-target" || return 1
-
-            git -C "$workdir" checkout --force --detach "$CHECKOUT_SHA" || return 1
-            test -f "$workdir/.github/actions/setup-node-env/action.yml" || return 1
-            echo "checkout attempt ${attempt}/2 succeeded"
-          }
-
-          for attempt in 1 2; do
-            if checkout_attempt "$attempt"; then
-              exit 0
-            fi
-            echo "checkout attempt ${attempt}/2 failed"
-            sleep $((attempt * 5))
-          done
-
-          echo "checkout failed after 2 attempts" >&2
-          exit 1
+        uses: ./.github/actions/checkout-ci-fast
+        with:
+          repo: ${{ github.repository }}
+          sha: ${{ github.sha }}
+          token: ${{ github.token }}
 
       - name: Setup Node environment
         uses: ./.github/actions/setup-node-env
@@ -1335,52 +966,11 @@ jobs:
     timeout-minutes: 20
     steps:
       - name: Checkout
-        shell: bash
-        env:
-          CHECKOUT_REPO: ${{ github.repository }}
-          CHECKOUT_SHA: ${{ github.sha }}
-          CHECKOUT_TOKEN: ${{ github.token }}
-        run: |
-          set -euo pipefail
-
-          workdir="$GITHUB_WORKSPACE"
-          auth_header="$(printf 'x-access-token:%s' "$CHECKOUT_TOKEN" | base64 | tr -d '\n')"
-
-          reset_checkout_dir() {
-            mkdir -p "$workdir"
-            find "$workdir" -mindepth 1 -maxdepth 1 -exec rm -rf {} +
-          }
-
-          checkout_attempt() {
-            local attempt="$1"
-
-            reset_checkout_dir
-            git init "$workdir" >/dev/null
-            git config --global --add safe.directory "$workdir"
-            git -C "$workdir" remote add origin "https://github.com/${CHECKOUT_REPO}"
-            git -C "$workdir" config gc.auto 0
-
-            timeout --signal=TERM 30s git -C "$workdir" \
-              -c protocol.version=2 \
-              -c "http.https://github.com/.extraheader=AUTHORIZATION: basic ${auth_header}" \
-              fetch --no-tags --prune --no-recurse-submodules --depth=1 origin \
-              "+${CHECKOUT_SHA}:refs/remotes/origin/ci-target" || return 1
-
-            git -C "$workdir" checkout --force --detach "$CHECKOUT_SHA" || return 1
-            test -f "$workdir/.github/actions/setup-node-env/action.yml" || return 1
-            echo "checkout attempt ${attempt}/2 succeeded"
-          }
-
-          for attempt in 1 2; do
-            if checkout_attempt "$attempt"; then
-              exit 0
-            fi
-            echo "checkout attempt ${attempt}/2 failed"
-            sleep $((attempt * 5))
-          done
-
-          echo "checkout failed after 2 attempts" >&2
-          exit 1
+        uses: ./.github/actions/checkout-ci-fast
+        with:
+          repo: ${{ github.repository }}
+          sha: ${{ github.sha }}
+          token: ${{ github.token }}
 
       - name: Setup Node environment
         uses: ./.github/actions/setup-node-env
@@ -1432,52 +1022,11 @@ jobs:
     timeout-minutes: 20
     steps:
       - name: Checkout
-        shell: bash
-        env:
-          CHECKOUT_REPO: ${{ github.repository }}
-          CHECKOUT_SHA: ${{ github.sha }}
-          CHECKOUT_TOKEN: ${{ github.token }}
-        run: |
-          set -euo pipefail
-
-          workdir="$GITHUB_WORKSPACE"
-          auth_header="$(printf 'x-access-token:%s' "$CHECKOUT_TOKEN" | base64 | tr -d '\n')"
-
-          reset_checkout_dir() {
-            mkdir -p "$workdir"
-            find "$workdir" -mindepth 1 -maxdepth 1 -exec rm -rf {} +
-          }
-
-          checkout_attempt() {
-            local attempt="$1"
-
-            reset_checkout_dir
-            git init "$workdir" >/dev/null
-            git config --global --add safe.directory "$workdir"
-            git -C "$workdir" remote add origin "https://github.com/${CHECKOUT_REPO}"
-            git -C "$workdir" config gc.auto 0
-
-            timeout --signal=TERM 30s git -C "$workdir" \
-              -c protocol.version=2 \
-              -c "http.https://github.com/.extraheader=AUTHORIZATION: basic ${auth_header}" \
-              fetch --no-tags --prune --no-recurse-submodules --depth=1 origin \
-              "+${CHECKOUT_SHA}:refs/remotes/origin/ci-target" || return 1
-
-            git -C "$workdir" checkout --force --detach "$CHECKOUT_SHA" || return 1
-            test -f "$workdir/.github/actions/setup-node-env/action.yml" || return 1
-            echo "checkout attempt ${attempt}/2 succeeded"
-          }
-
-          for attempt in 1 2; do
-            if checkout_attempt "$attempt"; then
-              exit 0
-            fi
-            echo "checkout attempt ${attempt}/2 failed"
-            sleep $((attempt * 5))
-          done
-
-          echo "checkout failed after 2 attempts" >&2
-          exit 1
+        uses: ./.github/actions/checkout-ci-fast
+        with:
+          repo: ${{ github.repository }}
+          sha: ${{ github.sha }}
+          token: ${{ github.token }}
 
       - name: Setup Node environment
         uses: ./.github/actions/setup-node-env