Cleanup android release notes workflow

Author: coreycb

.github/workflows/android.yml

@@ -1,4 +1,4 @@
----
+name: Validate Android Release Notes
 
 on:
   workflow_dispatch:  # Enables manual trigger
@@ -26,12 +26,13 @@ jobs:
         run: |
           pip install requests pyyaml jinja2
 
-      - name: Render Notes
+      - name: Validate Notes
         shell: bash
         working-directory: notes
         env:
-          BASE_REF: ${{ github.event.pull_request.base.ref }}
+          BASE_REF: ${{ github.event.pull_request.base.ref || github.head_ref }}
         run: |
+          echo "BASE_REF=${BASE_REF}"
           BETA_FILES=$(git diff --name-only origin/$BASE_REF $GITHUB_SHA | grep ^android_beta || true )
 
           for file in $BETA_FILES