[RT-5629] Added phpunit github workflow config.

Author: arslanim

.github/workflows/ci-checks.yml

@@ -20,4 +20,15 @@ jobs:
       - name: Install dependencies
         uses: php-actions/composer@v6
       - name: Run PHPStan
-        run: vendor/bin/phpstan analyse -c phpstan.neon.dist
+        run: vendor/bin/phpstan analyse -c phpstan.neon.dist
+  run-php-unit-tests:
+    needs: [ run-phpcs, run-php-stan ]
+    if: always()
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout code
+        uses: actions/checkout@v3
+      - name: Install dependencies
+        uses: php-actions/composer@v6
+      - name: Execute tests
+        run: vendor/bin/phpunit -c phpunit.xml --colors=always --verbose --testdox