chore(ci): remove impossible local checkout action

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

@@ -1,79 +0,0 @@
-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