* Get healthcheck URL from JSON file
Obtain Jupyter server's full URL from
/home/$NB_USER/.local/share/jupyter/runtime/*.json
and use it for healthcheck.
* Expand tests for healthcheck
* Update pre-commit config
* Remove workdir from tests
* Wait for container start with 0.1s interval
* Quote NB_USER variable on base-notebook/Dockerfile
* Fix style and make test actually work
* Ooops, GitHub didn't show last line
* Fix mypy
* Use bash with pipefail option for healthcheck
* Create python script for healthcheck
* Don't verify SSL certificate on healthcheck
* Update healthcheck test
- Add "user" parameter
- Add tests when container should not be healthy
* Fix typo
* Update test_healthcheck.py
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Co-authored-by: Ayaz Salikhov <mathbunnyru@users.noreply.github.com>