chore: add PostgreSQL service to CI pipeline

.github/workflows/ci.yml

@@ -10,6 +10,24 @@ jobs:
   build:
     runs-on: ubuntu-latest
 
+    services:
+      postgres:
+        image: postgres:16-alpine
+        env:
+          POSTGRES_DB: chess_api_test
+          POSTGRES_USER: app
+          POSTGRES_PASSWORD: ${{ secrets.DB_PASSWORD }}
+        options: >-
+          --health-cmd pg_isready
+          --health-interval 10s
+          --health-timeout 5s
+          --health-retries 5
+        ports:
+          - 5432:5432
+
+    env:
+      DATABASE_URL: postgresql://app:${{ secrets.DB_PASSWORD }}@127.0.0.1:5432/chess_api?serverVersion=16&charset=utf8
+
     steps:
       - uses: actions/checkout@v4
 
@@ -28,5 +46,11 @@ jobs:
       - name: Run PHPStan
         run: vendor/bin/phpstan analyse
 
+      - name: Create test database
+        run: php bin/console doctrine:database:create --env=test --no-interaction --if-not-exists
+
+      - name: Run database migrations
+        run: php bin/console doctrine:migrations:migrate --no-interaction --env=test
+
       - name: Run PHPUnit
         run: vendor/bin/phpunit