(feat): Add github action to check code style

.github/workflows/check-code-style.yml

@@ -0,0 +1,54 @@
+name: Check Code Style
+
+on: push
+
+jobs:
+  php-cs:
+    runs-on: ubuntu-latest
+    needs: what-has-changed
+    # Run only if PHP files have changed
+    if: ${{ needs.what-has-changed.outputs.php == 'true' }}
+    steps:
+      - name: Checkout code
+        uses: actions/checkout@v3
+
+      - name: Cache dependencies
+        uses: actions/cache@v3
+        with:
+          path: ~/.composer/cache/files
+          key: dependencies-composer-${{ hashFiles('composer.json') }}
+
+      - name: Setup PHP
+        uses: shivammathur/setup-php@v2
+        with:
+          php-version: 8.1
+          extensions: simplexml, tokenizer, xmlwriter
+          coverage: none
+
+      - name: Install dependencies
+        run: composer update --prefer-dist --no-interaction --no-suggest
+        env:
+          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+
+      - name: Execute tests
+        run:  ./vendor/bin/phpcs
+
+  # Job to check if certain files have changed
+  what-has-changed:
+    name: Detect file changes
+    runs-on: ubuntu-latest
+    outputs:
+      php: ${{ steps.filter.outputs.php }}
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v3
+        # For pull requests it's not necessary to checkout the code
+        if: ${{ github.event_name != 'pull_request' }}
+
+      - uses: dorny/paths-filter@v2
+        id: filter
+        with:
+          base: ${{ github.ref }}
+          filters: |
+            php:
+              - added|modified: 'src/**/*.php'