Add support for choosing docker image from dockerhub tags at login #1
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This PR implements support for multiple docker images. This is useful, because users can then test an upgraded environment and identify issues before we switch definitively.
Followed the explanation in jupyterhub/dockerspawner#219 to implement a dropdown for choosing the docker image version in a dropdown at login. Under the hood this follows this documentation: https://jupyterhub.readthedocs.io/en/stable/reference/spawners.html#spawner-options-from-form