message: workflows/automate_merge_message: fetch both head and base
diff: @@ -27,8 +27,8 @@ jobs:
  with:
  ref: '${{ github.event.pull_request.merge_commit_sha }}'
  - - name: fetch base
  - run: git fetch --depth 1 origin ${{ github.event.pull_request.base.sha }}
  + - name: fetch head & base
  + run: git fetch --depth 1 origin ${{ github.event.pull_request.head.sha }} ${{ github.event.pull_request.base.sha }}
  # We avoid using the in-source script since this workflow has elevated permissions that we don't want to expose
  - name: Generate Message
  