Add github action for code style check

.github/workflows/code-style.yml

@@ -0,0 +1,37 @@
+name: Code style
+
+on:
+  push:
+  pull_request:
+
+jobs:
+
+  check-code-style:
+    runs-on: ubuntu-latest
+
+    strategy:
+      fail-fast: false
+      matrix:
+        php: ['8.2']
+
+    name: "Check code style | PHP ${{ matrix.php }}"
+
+    steps:
+      - name: Checkout code
+        uses: actions/checkout@v3
+
+      - name: Install PHP with latest composer
+        uses: shivammathur/setup-php@v2
+        with:
+          php-version: ${{ matrix.php }}
+          ini-values: error_reporting=-1, display_errors=On, log_errors_max_len=0
+          coverage: none
+          tools: none
+
+      # Install dependencies and handle caching in one go.
+      # @link https://github.com/marketplace/actions/install-composer-dependencies
+      - name: "Install Composer dependencies"
+        uses: "ramsey/composer-install@v2"
+
+      - name: "Check code style"
+        run: composer run codestyle -- --dry-run