portdb also uses coverage, so provide $TOP there

.github/workflows/tests.yml

@@ -250,6 +250,8 @@ jobs:
     if: ${{ !failure() && !cancelled() }} # Allow previous steps to be skipped, but not fail
     needs: linting-done
     runs-on: ubuntu-latest
+    env:
+      TOP: ${{ github.workspace }}
     strategy:
       matrix:
         include: