ColtenOuO opened a new pull request, #71334:
URL: https://github.com/apache/airflow/pull/71334

   ### Sumarry
   
   Two steps in `.github/actions/migration_tests/action.yml` reference 
`${DB_MANGERS}`
   while the surrounding `env:` block defines `DB_MANAGERS`. The variable is 
undefined,
   so the export resolves to `AIRFLOW__DATABASE__EXTERNAL_DB_MANAGERS=` 
(empty). The
   other two steps in the same file spell it correctly.
   
   Nothing fails: GitHub's default `shell: bash` runs without `-u`, `export X=` 
on its
   own line is valid, and the migration commands on the next line run normally 
— so the
   steps have stayed green since the typo was introduced in #50343.
   
   **Current impact: none.** 
   
   Since #62308, `RunDBManager` starts from DB managers
   auto-discovered via `provider.yaml`, and the FAB provider declares its own, 
so the
   empty config is simply skipped. This is a cleanup: it removes a silent 
failure that
   would come back if discovery were ever not in play, and stops the file 
contradicting
   itself.
   


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