ci(GitHub): update import maps workflow to use correct branch reference for push and PR comment

Author: trieloff

.github/workflows/update-importmaps.yml

@@ -15,6 +15,7 @@ jobs:
       with:
         token: ${{ secrets.GITHUB_TOKEN }}
         fetch-depth: 0
+        ref: ${{ github.head_ref }}
     - name: Configure Git
       run: |
         git config user.name 'github-actions[bot]'
@@ -27,10 +28,10 @@ jobs:
       run: |
         git add -A
         git commit -m "chore(oversight): update import maps"
-        git push
+        git push origin HEAD:${{ github.head_ref }}
     - name: Update PR comment to include aem.live test URL
       run: |
         OLD_BODY=$(gh pr view --json body --jq ".body")
-        BRANCH_NAME=$(echo ${{ github.ref }} | sed 's|refs/heads/||')
+        BRANCH_NAME=$(echo ${{ github.head_ref }})
         NEW_BODY="$OLD_BODY\n\nTest at: https://$BRANCH_NAME--helix-website--adobe.aem.live/tools/oversight/explorer.html?domain=www.emigrationbrewing.com"
         gh pr edit ${{ github.event.number }} --body "$NEW_BODY"