set usage_mode

[codecov[bot]]

Codecov Report

Attention: Patch coverage is 0% with 1 line in your changes missing coverage. Please review.

Project coverage is 44.27%. Comparing base (e35b8c4) to head (bb860f2). Report is 2 commits behind head on main.

Files with missing lines	Patch %	Lines
src/jupyterhub_config/custom_docker_spawner.py	0.00%	1 Missing :warning:

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #106 +/- ## ========================================== - Coverage 44.37% 44.27% -0.10% ========================================== Files 7 7 Lines 462 463 +1 ========================================== Hits 205 205 - Misses 257 258 +1 ```

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