fix: Add debug output to module monitor workflow for troubleshooting

Author: krish2718

.github/workflows/module-monitor.yml

@@ -22,6 +22,7 @@ jobs:
         with:
           fetch-depth: 0
           persist-credentials: false
+          ref: ${{ github.event.pull_request.head.sha }}
 
       - name: Set up Python
         uses: actions/setup-python@v5
@@ -43,7 +44,12 @@ jobs:
           if [ "$GITHUB_EVENT_NAME" = "pull_request_target" ]; then
             BASE_REF="$GITHUB_BASE_SHA"
             HEAD_REF="$GITHUB_HEAD_SHA"
+            echo "DEBUG: Comparing $BASE_REF to $HEAD_REF" >&2
+            echo "DEBUG: Current HEAD is $(git rev-parse HEAD)" >&2
+            echo "DEBUG: Available commits:" >&2
+            git log --oneline -5 >&2
             DIFF_OUTPUT=$(git diff $BASE_REF $HEAD_REF -- zephyr/module.yml || echo "No changes found")
+            echo "DEBUG: Diff result: $DIFF_OUTPUT" >&2
           else
             # For push events, get the previous commit that modified module.yml
             PREV_COMMIT=$(git log --oneline --follow -- zephyr/module.yml | head -2 | tail -1 | cut -d' ' -f1)