CI: Configured code quality test (#6)

Configured the PHP Code Sniffer for code quality test

Resolves task: CI/CD: Configure workflows (#6)

.github/workflows/test.yml

@@ -18,3 +18,19 @@ jobs:
 
     - name: Check PHP syntax errors
       uses: overtrue/phplint@9.1.2
+
+  code-quality-test:
+    runs-on: ubuntu-latest
+
+    steps:
+      - uses: actions/checkout@v3
+
+      - name: Composer install
+        uses: php-actions/composer@v6
+
+      - name: PHP Code Sniffer
+        uses: php-actions/phpcs@v1
+        with:
+          php_version: 8.2
+          path: www/
+          standard: phpcs.xml