Added code analysis action

.github/workflows/pr.yml

@@ -83,6 +83,36 @@ jobs:
         run: |
           composer coding-standards-check/phpcs
 
+  php-code-analysis:
+    name: PHP code analysis
+    runs-on: ubuntu-latest
+    strategy:
+      matrix:
+        php-versions: [ '8.1' ]
+        dependency-version: [ prefer-lowest, prefer-stable ]
+    steps:
+      - uses: actions/checkout@master
+      - name: Setup PHP, with composer and extensions
+        uses: shivammathur/setup-php@v2
+        with:
+          php-version: ${{ matrix.php-versions }}
+          extensions: json
+          coverage: none
+          tools: composer:v2
+      # https://github.com/shivammathur/setup-php#cache-composer-dependencies
+      - name: Get composer cache directory
+        id: composer-cache
+        run: echo "::set-output name=dir::$(composer config cache-files-dir)"
+      - name: Cache dependencies
+        uses: actions/cache@v2
+        with:
+          path: ${{ steps.composer-cache.outputs.dir }}
+          key: ${{ runner.os }}-composer-${{ hashFiles('**/composer.lock') }}
+          restore-keys: ${{ runner.os }}-composer-
+      - name: Code analysis
+        run: |
+          ./scripts/code-analysis
+
   markdownlint:
     runs-on: ubuntu-latest
     name: markdownlint