Chore: [AEA-0000] - fix ci workflow (#3)

## Summary

- Routine Change

### Details

- fix ci workflow

Author: anthony-nhs

.github/workflows/ci.yml

@@ -27,6 +27,6 @@ jobs:
         with:
             dry_run: true
             pinned_image: ${{ needs.get_config_values.outputs.pinned_image }}
-            branch_name: ${{ github.event.pull_request.head.ref }}
+            branch_name: main
             tag_format: ${{ needs.get_config_values.outputs.tag_format }}
         secrets: inherit