Build/Test Tools: Restore reusable Gutenberg build workflow.

Restores the workflow file for the Test the Gutenberg plugin Build Process. The reusable workflows are used by multiple branches and needs to be retained.

Follow up to and partial revert of r61438.

Props peterwilsoncc, jorbin.
See #64393.





git-svn-id: https://develop.svn.wordpress.org/trunk@61580 602fd350-edb4-49c9-b593-d223f7449a82

Author: peterwilsoncc

.github/workflows/reusable-test-gutenberg-build-process.yml

@@ -0,0 +1,100 @@
+##
+# A reusable workflow that tests the Gutenberg plugin build process when run within a wordpress-develop checkout.
+##
+name: Test the Gutenberg plugin Build Process
+
+on:
+  workflow_call:
+    inputs:
+      os:
+        description: 'Operating system to run tests on'
+        required: false
+        type: 'string'
+        default: 'ubuntu-24.04'
+      directory:
+        description: 'Directory to run WordPress from. Valid values are `src` or `build`'
+        required: false
+        type: 'string'
+        default: 'src'
+
+env:
+  GUTENBERG_DIRECTORY: ${{ inputs.directory == 'build' && 'build' || 'src' }}/wp-content/plugins/gutenberg
+  PUPPETEER_SKIP_DOWNLOAD: ${{ true }}
+  NODE_OPTIONS: '--max-old-space-size=8192'
+
+# Disable permissions for all available scopes by default.
+# Any needed permissions should be configured at the job level.
+permissions: {}
+
+jobs:
+  # Verifies that installing npm dependencies and building the Gutenberg plugin works as expected.
+  #
+  # Performs the following steps:
+  # - Checks out the repository.
+  # - Checks out the Gutenberg plugin into the plugins directory.
+  # - Sets up Node.js.
+  # - Logs debug information about the GitHub Action runner.
+  # - Installs Gutenberg npm dependencies.
+  # - Runs the Gutenberg build process.
+  # - Installs Core npm dependencies.
+  # - Builds WordPress to run from the relevant location (src or build).
+  # - Builds Gutenberg.
+  # - Ensures version-controlled files are not modified or deleted.
+  build-process-tests:
+    name: ${{ contains( inputs.os, 'macos-' ) && 'MacOS' || contains( inputs.os, 'windows-' ) && 'Windows' || 'Linux' }}
+    permissions:
+      contents: read
+    runs-on: ${{ inputs.os }}
+    timeout-minutes: 30
+
+    steps:
+      - name: Checkout repository
+        uses: actions/checkout@08c6903cd8c0fde910a37f88322edcfb5dd907a8 # v5.0.0
+        with:
+          show-progress: ${{ runner.debug == '1' && 'true' || 'false' }}
+          persist-credentials: false
+
+      - name: Checkout Gutenberg plugin
+        uses: actions/checkout@08c6903cd8c0fde910a37f88322edcfb5dd907a8 # v5.0.0
+        with:
+          repository: 'WordPress/gutenberg'
+          path: ${{ env.GUTENBERG_DIRECTORY }}
+          show-progress: ${{ runner.debug == '1' && 'true' || 'false' }}
+          persist-credentials: false
+
+      - name: Set up Node.js
+        uses: actions/setup-node@2028fbc5c25fe9cf00d9f06a71cc4710d4507903 # v6.0.0
+        with:
+          node-version-file: '.nvmrc'
+          cache: npm
+          cache-dependency-path: |
+            package-lock.json
+            ${{ env.GUTENBERG_DIRECTORY }}/package-lock.json
+
+      - name: Log debug information
+        run: |
+          npm --version
+          node --version
+          curl --version
+          git --version
+
+      - name: Install Gutenberg Dependencies
+        run: npm ci
+        working-directory: ${{ env.GUTENBERG_DIRECTORY }}
+
+      - name: Build Gutenberg
+        run: npm run build
+        working-directory: ${{ env.GUTENBERG_DIRECTORY }}
+
+      - name: Install Core Dependencies
+        run: npm ci
+
+      - name: Build WordPress to run from ${{ inputs.directory }}
+        run: npm run ${{ inputs.directory == 'src' && 'build:dev' || 'build' }}
+
+      - name: Run Gutenberg build script after building Core to run from ${{ inputs.directory }}
+        run: npm run build
+        working-directory: ${{ env.GUTENBERG_DIRECTORY }}
+
+      - name: Ensure version-controlled files are not modified or deleted during building
+        run: git diff --exit-code