🧪 Log base_ref @ GHA runs for PRs

Author: webknjaz

.github/workflows/reusable-smoke-test.yml

@@ -33,6 +33,10 @@ jobs:
     timeout-minutes: 1
 
     steps:
+    - name: Fail on PRs against illegal branches
+      if: github.event_name == 'pull_request'
+      run: echo github.base_ref='"${{ github.base_ref }}"'
+
     - name: Fail on PRs against illegal branches
       if: >-
         github.event_name == 'pull_request' &&