[RT-5629] Added phpstan into workflow.

Author: arslanim

.github/workflows/ci-checks.yml

@@ -11,4 +11,13 @@ jobs:
       - name: Install dependencies
         uses: php-actions/composer@v6
       - name: Run PHPCodesniffer
-        run: ./vendor/bin/phpcs -p -s --standard=phpcs.xml src tests
+        run: ./vendor/bin/phpcs -p -s --standard=phpcs.xml src tests
+  run-php-stan:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout code
+        uses: actions/checkout@v3
+      - name: Install dependencies
+        uses: php-actions/composer@v6
+      - name: Run PHPStan
+        run: vendor/bin/phpstan analyse -c phpstan.neon.dist