propagation support for bind mounts (once docker-py supports it officially)

[jannefleischer]

I added a pull request for propagation support in docker-py (docker/docker-py#3164) which has to be accepted before this PR makes any sense.

Also I just realized that there seem to be other options (Mount specs???) in dockerspawner to enable propagation, but since documentation of docker-py is sparse, I couldn't figure out how to use that...

This might be helpful for others that want to use autofs in their jupyter-container launched by dockerspawner.

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[jannefleischer]

docker/docker-py#3164 has been merged via docker/docker-py@0f0b20a

[minrk]

If it required a manual patch, I would not consider this patch appropriate for this project, but since it's merged, can you reference the required version of docker-py here? It's not clear to me what that is.

[jannefleischer]

Currently I am still waiting for a new release of docker-py (pypi | github). So any version after august 15, 2023 will hold the necessary patch. I will continue monitoring this and I'll let you know, once we have a version we can rely on.

[jannefleischer]

Just a heads up: From 7.0.0b2 and forward the propagation thingy is supported. - but its still pre-release.

[jannefleischer]

docker-py 7.0 is published officially, which includes the support for propagation: https://github.com/docker/docker-py/releases/tag/7.0.0 - so this pr could be merged if a new dependency on docker-py 7.0.0 is ok.