The alembic-multi-head job is not running on merge_group

## Summary  

[Provide a brief description of the bug.]  

- The alembic-multi-head job is not running on merge_group.

## Steps to Reproduce  

[Outline the steps to consistently reproduce the issue.]  

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## Expected Behavior  

[Describe the expected result if the bug were resolved.]  

-

## Actual Behavior  

[Describe what actually happens when the bug occurs.]  

-

## Logs/Errors  

[Attach relevant logs, stack traces, or screenshots to help diagnose the issue.]  

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