Update Dependabot auto-merge workflow based on latest GitHub documentation

.github/workflows/auto-merge.yml

@@ -1,11 +1,10 @@
-name: Automerge
+# This is based on <https://docs.github.com/en/code-security/supply-chain-security/keeping-your-dependencies-updated-automatically/automating-dependabot-with-github-actions#enable-auto-merge-on-a-pull-request>.
+name: Dependabot auto-merge
+on: pull_request
 
-on:
-  # ⚠️ WARNING: Secrets can be accessed by forks when triggered via this event!
-  # In this case no code is checked out and no cache is being saved, so this workflow should be fine.
-  # See https://securitylab.github.com/research/github-actions-preventing-pwn-requests/.
-  pull_request_target:
-    types: [opened, reopened, synchronize]
+permissions:
+  pull-requests: write
+  contents: write
 
 # Cancel previous workflow run groups that have not completed.
 concurrency:
@@ -14,15 +13,24 @@ concurrency:
   cancel-in-progress: true
 
 jobs:
-  automerge-dependencies:
-    name: Automerge dependencies
+  dependabot:
     runs-on: ubuntu-latest
-    if: >
-      github.actor == 'dependabot[bot]' &&
-      github.event.pull_request.auto_merge == null
+    if: ${{ github.actor == 'dependabot[bot]' }}
     steps:
-      - name: Enable auto-merge for the PR
+      - name: Dependabot metadata
+        id: metadata
+        uses: dependabot/fetch-metadata@v1.1.1
+        with:
+          github-token: "${{ secrets.GITHUB_TOKEN }}"
+      - name: Approve PR
+        run: gh pr review --approve "$PR_URL"
+        if: ${{ steps.metadata.outputs.update-type == 'version-update:semver-patch' }}
+        env:
+          PR_URL: ${{github.event.pull_request.html_url}}
+          GITHUB_TOKEN: ${{secrets.GITHUB_TOKEN}}
+      - name: Enable auto-merge for Dependabot PRs
+        if: ${{ github.event.pull_request.auto_merge == null && steps.metadata.outputs.update-type == 'version-update:semver-patch' }}
         run: gh pr merge --auto --merge "$PR_URL"
         env:
-          PR_URL: ${{ github.event.pull_request.html_url }}
-          GITHUB_TOKEN: ${{ secrets.AUTOMERGE_TOKEN }}
+          PR_URL: ${{github.event.pull_request.html_url}}
+          GITHUB_TOKEN: ${{secrets.GITHUB_TOKEN}}

.github/workflows/build-test-measure.yml

@@ -343,7 +343,6 @@ jobs:
     name: "Unit test${{ matrix.coverage && ' (with coverage)' || '' }}: PHP ${{ matrix.php }}, WP ${{ matrix.wp }}"
     runs-on: ubuntu-latest
     needs: pre-run
-    if: needs.pre-run.outputs.changed-file-count > 0
     env:
       WP_CORE_DIR: /tmp/wordpress
     services:
@@ -400,10 +399,20 @@ jobs:
             coverage: false
 
     steps:
+      # Note: The repeated `needs.pre-run.outputs.changed-php-count > 0` checks would be avoided if a step could short-
+      # circuit per <https://github.com/actions/runner/issues/662>. The reason why the if statement can't be put on the
+      # job as a whole is because the name is variable based on the matrix, and if the condition is not met then the
+      # name won't be interpolated in order to match the required jobs set up in branch protection.
+      - name: Notice
+        if: needs.pre-run.outputs.changed-php-count == 0
+        run: echo "No PHP files were changed so no PHP unit tests will run"
+
       - name: Checkout
+        if: needs.pre-run.outputs.changed-php-count > 0
         uses: actions/checkout@v3
 
       - name: Setup PHP
+        if: needs.pre-run.outputs.changed-php-count > 0
         uses: shivammathur/setup-php@v2
         with:
           php-version: ${{ matrix.php }}
@@ -412,25 +421,30 @@ jobs:
           ini-values: pcov.directory=.
 
       - name: Shutdown default MySQL service
+        if: needs.pre-run.outputs.changed-php-count > 0
         run: sudo service mysql stop
 
       - name: Verify MariaDB connection
+        if: needs.pre-run.outputs.changed-php-count > 0
         run: |
           while ! mysqladmin ping -h"127.0.0.1" -P"${{ job.services.mysql.ports[3306] }}" --silent; do
             sleep 1
           done
 
       - name: Setup Node
+        if: needs.pre-run.outputs.changed-php-count > 0
         uses: actions/setup-node@v3.0.0
         with:
           node-version-file: '.nvmrc'
           cache: npm
 
       - name: Get Composer Cache Directory
+        if: needs.pre-run.outputs.changed-php-count > 0
         id: composer-cache
         run: echo "::set-output name=dir::$(composer config cache-files-dir)"
 
       - name: Configure Composer cache
+        if: needs.pre-run.outputs.changed-php-count > 0
         uses: actions/cache@v2
         with:
           path: ${{ steps.composer-cache.outputs.dir }}
@@ -439,29 +453,35 @@ jobs:
             ${{ runner.os }}-composer-
 
       - name: Install Composer dependencies
+        if: needs.pre-run.outputs.changed-php-count > 0
         run: composer install --prefer-dist --ignore-platform-reqs --no-progress --no-interaction
 
       - name: Install Node dependencies
+        if: needs.pre-run.outputs.changed-php-count > 0
         run: npm ci
         env:
           CI: true
 
       - name: Build plugin
+        if: needs.pre-run.outputs.changed-php-count > 0
         run: npm run build:js
 
       # Scan the logs for failing tests and surface that information by creating annotations and log file decorations.
       - name: Setup problem matcher to provide annotations for PHPUnit
+        if: needs.pre-run.outputs.changed-php-count > 0
         # The JSON file is provided by the `shivammathur/setup-php` action. See https://github.com/shivammathur/setup-php#problem-matchers.
         run: echo "::add-matcher::${{ runner.tool_cache }}/phpunit.json"
 
       - name: Install WP tests
+        if: needs.pre-run.outputs.changed-php-count > 0
         run: bash bin/ci/install-wp-tests.sh wordpress_test root '' 127.0.0.1:${{ job.services.mysql.ports['3306'] }} ${{ matrix.wp }} true
 
       - name: Post install of WP tests
+        if: needs.pre-run.outputs.changed-php-count > 0
         run: bash bin/ci/after-wp-install.sh ${{ matrix.wp }} ${{ matrix.install-pwa-plugin == true }} /tmp/wordpress-tests
 
       - name: Setup PCOV
-        if: ${{ matrix.coverage == true }}
+        if: ${{ matrix.coverage == true && needs.pre-run.outputs.changed-php-count > 0 }}
         # phpdocumentor/reflection has to be removed as it makes use of an outdated dependency, making pcov/clobber
         # unable to be installed.
         run: |
@@ -470,25 +490,26 @@ jobs:
           vendor/bin/pcov clobber
 
       - name: Copy plugin to WP plugins directory
+        if: needs.pre-run.outputs.changed-php-count > 0
         run: cp -r "$PWD" "$WP_CORE_DIR/src/wp-content/plugins/amp"
 
       - name: Run tests
-        if: ${{ matrix.coverage == false }}
+        if: ${{ matrix.coverage == false && needs.pre-run.outputs.changed-php-count > 0 }}
         run: vendor/bin/phpunit --verbose
         working-directory: ${{ env.WP_CORE_DIR }}/src/wp-content/plugins/amp
 
       - name: Run tests with coverage
-        if: ${{ matrix.coverage == true }}
+        if: ${{ matrix.coverage == true && needs.pre-run.outputs.changed-php-count > 0 }}
         run: vendor/bin/phpunit --verbose --coverage-clover build/logs/clover.xml
         working-directory: ${{ env.WP_CORE_DIR }}/src/wp-content/plugins/amp
 
       - name: Run external HTTP tests
-        if: ${{ matrix.external-http == true }}
+        if: ${{ matrix.external-http == true && needs.pre-run.outputs.changed-php-count > 0 }}
         run: vendor/bin/phpunit --testsuite external-http
         working-directory: ${{ env.WP_CORE_DIR }}/src/wp-content/plugins/amp
 
       - name: Upload code coverage report
-        if: ${{ matrix.coverage == true }}
+        if: ${{ matrix.coverage == true && needs.pre-run.outputs.changed-php-count > 0 }}
         uses: codecov/codecov-action@v2.1.0
         with:
           file: ${{ env.WP_CORE_DIR }}/src/wp-content/plugins/amp/build/logs/clover.xml
@@ -500,7 +521,7 @@ jobs:
   feature-test-php:
     name: "Feature test${{ matrix.coverage && ' (with coverage)' || '' }}: PHP ${{ matrix.php }}, WP ${{ matrix.wp }}"
     needs: pre-run
-    if: needs.pre-run.outputs.changed-file-count > 0
+    if: needs.pre-run.outputs.changed-php-count > 0
     runs-on: ubuntu-latest
     env:
       WP_VERSION: ${{ matrix.wp }}

.github/workflows/gutenberg-packages-update.yml

@@ -7,6 +7,10 @@ on:
     # Once a day (https://crontab.guru/once-a-day)
     - cron: '0 0 * * *'
 
+permissions:
+  pull-requests: write
+  contents: write
+
 # Cancel previous workflow run groups that have not completed.
 concurrency:
   # Group workflow runs by workflow name, along with the head branch ref of the pull request
@@ -168,6 +172,6 @@ jobs:
           gh pr merge --auto --merge "$PR_URL"
         env:
           VERSION: ${{ needs.check-gutenberg-release.outputs.latest-version }}
-          GITHUB_TOKEN: ${{ secrets.GUTENBERG_PACKAGES_UPDATE_TOKEN }}
+          GITHUB_TOKEN: ${{secrets.GITHUB_TOKEN}}
           BASE_BRANCH: ${{ steps.branches.outputs.base }}
           HEAD_BRANCH: ${{ steps.branches.outputs.head }}