Skip Docker login on PRs from forks

Author: mrotteveel

.github/workflows/run-tests.yml

@@ -30,6 +30,8 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - name: Login to Docker Hub
+        # PRs from forks don't have access to the secrets, skip Docker login and hope we don't hit the rate limit
+        if: ${{ !github.event.pull_request.head.repo.fork }}
         uses: docker/login-action@v4
         with:
           username: ${{ secrets.DOCKERHUB_USERNAME }}