ci: skip integration tests if CLOUDSCALE_API_TOKEN is missing

Dependabot PRs and PRs from forks do not have access to repository
secrets. This change ensures that the integration test job is skipped
when the API token is unavailable, preventing unnecessary build
failures while still allowing linting and unit tests to run.

Author: alakae

.github/workflows/ccm-integration-tests.yml

@@ -122,6 +122,12 @@ jobs:
   integration:
     name: "Kubernetes ${{ matrix.kubernetes }}"
     runs-on: ubuntu-latest
+    # Skip integration tests for pull requests from forks (secrets aren't available there).
+    # Admins can manually trigger this job for a specific branch via the 'Actions' tab
+    # using 'workflow_dispatch' after reviewing the code changes.
+    if: |
+      github.event_name != 'pull_request' ||
+      github.event.pull_request.head.repo.full_name == github.repository
 
     needs:
       - lint