Extra git commands for diagnosis

.github/workflows/pr-checks.yml

@@ -48,6 +48,9 @@ jobs:
       run: |
         # Show all commands as run
         set -x
+        git branch
+        git log | head -100
+        git diff
         # stop the build if there are Python syntax errors or undefined names, ignore existing 
         git diff "${BASE_REF}" | flake8 . --count --select=E9,F63,F7,F82 --show-source --statistics --diff
         # exit-zero treats all errors as warnings. The GitHub editor is 127 chars wide