try get ip from container

[codecov[bot]]

Codecov Report

Attention: Patch coverage is 37.50000% with 5 lines in your changes missing coverage. Please review.

Project coverage is 47.30%. Comparing base (5d7afe6) to head (f8e9cda).

Files with missing lines	Patch %	Lines
src/jupyterhub_config/hub_singleuser.py	28.57%	5 Missing :warning:

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #99 +/- ## ========================================== - Coverage 47.51% 47.30% -0.21% ========================================== Files 7 7 Lines 402 408 +6 ========================================== + Hits 191 193 +2 - Misses 211 215 +4 ```

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