fix: Add debug output to module monitor workflow for troubleshooting

Author: krish2718

.github/workflows/module-monitor.yml

@@ -23,6 +23,11 @@ jobs:
           fetch-depth: 0
           persist-credentials: false
 
+      - name: Fetch PR head
+        if: github.event_name == 'pull_request_target'
+        run: |
+          git fetch origin pull/${{ github.event.pull_request.number }}/head:pr-head
+
       - name: Set up Python
         uses: actions/setup-python@v5
         with:
@@ -40,10 +45,15 @@ jobs:
           GITHUB_HEAD_SHA: ${{ github.event.pull_request.head.sha || '' }}
         run: |
           # For pull requests, compare with base branch
-          if [ "$GITHUB_EVENT_NAME" = "pull_request_target" ]; then
+          if [ "$GITHUB_EVENT_NAME" = "pull_request" ]; then
             BASE_REF="$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)
@@ -95,7 +105,7 @@ jobs:
           EOF
 
       - name: Create or update comment (Pull Request)
-        if: github.event_name == 'pull_request_target'
+        if: github.event_name == 'pull_request'
         uses: actions/github-script@v7
         with:
           script: |