Add Drupal core baseline check (#554)

Author: mglaman

.github/workflows/php.yml

@@ -206,3 +206,58 @@ jobs:
         run: |
           cd ~/drupal
           ./vendor/bin/phpstan analyze web/core/modules/dynamic_page_cache --debug
+
+  core_baseline:
+    needs:
+      - lint
+      - tests
+    continue-on-error: true
+    runs-on: "ubuntu-latest"
+    name: "Drupal core HEAD baseline check"
+    steps:
+      - name: "Checkout"
+        uses: "actions/checkout@v3"
+      - name: "set the version alias for self"
+        run: |
+          if [ "${{ github.event_name }}" == 'pull_request' ]; then
+            echo ::set-output name=VERSION_ALIAS::dev-"${{ github.sha }}"
+          else
+            echo ::set-output name=VERSION_ALIAS::dev-main
+          fi
+        id: branch_alias
+      - name: determine phpstan cache directory
+        run: echo PHPSTAN_TMP_DIR=$(php -r "print sys_get_temp_dir() . '/phpstan';") >> $GITHUB_OUTPUT
+        id: phpstan_tmp_dir
+      - name: cache phpstan
+        uses: actions/cache@v3
+        with:
+          path: ${{ steps.phpstan_tmp_dir.outputs.PHPSTAN_TMP_DIR }}
+          key: ${{ runner.os }}-phpstan-core-baseline
+          restore-keys: ${{ runner.os }}-phpstan-core-baseline
+      - name: "Install PHP"
+        uses: "shivammathur/setup-php@v2"
+        with:
+          coverage: "none"
+          php-version: "8.1"
+          tools: composer:v2
+          extensions: dom, curl, libxml, mbstring, zip, pdo, mysql, pdo_mysql, gd, apcu
+      - name: "Checkout Drupal core"
+        run: |
+         cd ${{ runner.temp }}
+         git clone https://git.drupalcode.org/project/drupal.git
+         cd drupal
+         composer config repositories.0 composer https://packages.drupal.org/8
+         composer config repositories.1 path $GITHUB_WORKSPACE
+
+      - name: "Install Drupal core dependencies"
+        uses: "ramsey/composer-install@v2"
+        with:
+          working-directory: "${{ runner.temp }}/drupal"
+      - name: "require phpstan-drupal"
+        run: |
+          cd ${{ runner.temp }}/drupal
+          composer require --dev mglaman/phpstan-drupal "${{ steps.branch_alias.outputs.VERSION_ALIAS }} as 1.1.99" --with-all-dependencies
+      - name: "Check baseline"
+        run: |
+          cd ${{ runner.temp }}/drupal
+          ./vendor/bin/phpstan analyze --configuration=core/phpstan.neon.dist