change detection

Author: AA-Turner

.github/workflows/reusable-context.yml

@@ -73,6 +73,7 @@ jobs:
     - run: echo ${{ github.repository }}
     - run: echo ${{ github.event.pull_request.head.sha }}
     - run: echo ${{ env.GITHUB_HEAD_REF }}
+    - run: echo $GITHUB_HEAD_REF
 
     # Adapted from https://github.com/actions/checkout/issues/520#issuecomment-1167205721
     - name: Fetch commits to get branch diff