Limit parallelism

Author: ValentaTomas

.github/workflows/pr_tests.yml

@@ -18,5 +18,7 @@ jobs:
         uses: docker/setup-buildx-action@v3
 
       - name: Run tests with devtool
+        env:
+          PYTEST_ADDOPTS: "-n 2"
         run: |
           ./tools/devtool -y test -- integration_tests/functional/