Adding GH context refs

Added step to show GH context refs and understand where this job would be committing changes.

.github/workflows/render-rmarkdown.yaml

@@ -19,11 +19,19 @@ jobs:
     concurrency:
       group: rmarkdown-${{ github.event_name != 'pull_request' || github.run_id }}
     env:
+      BRANCH_NAME: ${{ github.head_ref || github.ref_name }} 
       GITHUB_PAT: ${{ secrets.GITHUB_TOKEN }}
     permissions:
       contents: write
 
     steps:
+      - name: Showing GH context refs
+        shell: bash
+        run: |
+          echo github.head_ref ${{ github.head_ref }}
+          echo github.ref ${{ github.ref }}
+          echo github.ref_name ${{ github.ref_name }}
+          
       - name: Checkout PR branch
         uses: actions/checkout@v4
         with: