CI: make node deps install optional in setup action

.github/actions/setup-node-env/action.yml

@@ -1,7 +1,7 @@
 name: Setup Node environment
 description: >
   Initialize submodules with retry, install Node 22, pnpm, optionally Bun,
-  and run pnpm install. Requires actions/checkout to run first.
+  and optionally run pnpm install. Requires actions/checkout to run first.
 inputs:
   node-version:
     description: Node.js version to install.
@@ -19,6 +19,10 @@ inputs:
     description: Use Blacksmith sticky disks for pnpm store caching.
     required: false
     default: "false"
+  install-deps:
+    description: Whether to run pnpm install after environment setup.
+    required: false
+    default: "true"
   frozen-lockfile:
     description: Whether to use --frozen-lockfile for install.
     required: false
@@ -44,7 +48,7 @@ runs:
       uses: actions/setup-node@49933ea5288caeca8642d1e84afbd3f7d6820020 # v4.4.0
       with:
         node-version: ${{ inputs.node-version }}
-        check-latest: true
+        check-latest: false
 
     - name: Setup pnpm + cache store
       uses: ./.github/actions/setup-pnpm-store-cache
@@ -68,10 +72,12 @@ runs:
         if command -v bun &>/dev/null; then bun -v; fi
 
     - name: Capture node path
+      if: inputs.install-deps == 'true'
       shell: bash
       run: echo "NODE_BIN=$(dirname "$(node -p "process.execPath")")" >> "$GITHUB_ENV"
 
     - name: Install dependencies
+      if: inputs.install-deps == 'true'
       shell: bash
       env:
         CI: "true"