👷 Run mypy by pre-commit (#2169)

backend/app/alembic/env.py

@@ -10,6 +10,7 @@ config = context.config
 
 # Interpret the config file for Python logging.
 # This line sets up loggers basically.
+assert config.config_file_name is not None
 fileConfig(config.config_file_name)
 
 # add your model's MetaData object here