gh actions: disable job on forked PR's

.github/workflows/issues-workflow.yaml

@@ -11,6 +11,7 @@ on:
 jobs:
   add-to-project:
     name: Add issue to project
+    if: github.event.pull_request.head.repo.full_name == github.repository  # Only run jobs if the feature branch is in your repo (not in a fork)
     runs-on: ubuntu-latest
     steps:
       - uses: actions/[email protected]