Spike: split out custom config

[agoose77]

Our JupyterHub config is quite large (1701 lines). Much of this is inline vendored Python. Through time, this has been tested, but if we were to write this from scratch it would be a difficult exercise to avoid introducing string formatting bugs and other problems.

This PR is a spike to pull out the config files into lint-able files. The problem with this spike is that the JupyterHub deployment does not depend upon the checksum of the configmap, so changes to these config files do not lead to a hub restart. It seems quite difficult to plumb that feature in to the base chart, and I suspect that's a good reason for why things are done this way at the moment.

CC @GeorgianaElena because it's relevant to our quarterly objective, but I'm not asking any time from you here!

Some questions:

• Is this worth pursuing?
• Can we use a Helm postinstall hook here to trigger a hub reload? Is that acceptable as additional moving parts? https://helm.sh/docs/topics/charts_hooks/
• Could/should we use Jsonnet to handle the error-prone configmap mount expansion? Or perhaps the upstream z2jh should support loading jupyterhub_config.d/foo/bar.py automatically.

Note

I haven't tested this deployment.

[github-actions]

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Staging deployments

Cloud Provider	Cluster Name	Hub Name	Reason for Redeploy
gcp	leap	staging	Core infrastructure has been modified
aws	berkeley-geojupyter	staging	Core infrastructure has been modified
aws	temple	staging	Core infrastructure has been modified
aws	nasa-ghg-hub	staging	Core infrastructure has been modified
aws	aimatx-2i2c-hub	staging	Core infrastructure has been modified
aws	bnext-bio	staging	Core infrastructure has been modified
aws	victor	staging	Core infrastructure has been modified
kubeconfig	2i2c-jetstream2	staging	Core infrastructure has been modified
gcp	2i2c	staging	Core infrastructure has been modified
aws	nmfs-openscapes	staging	Core infrastructure has been modified
gcp	hhmi	staging	Core infrastructure has been modified
aws	projectpythia	staging	Core infrastructure has been modified
kubeconfig	utoronto	staging	Core infrastructure has been modified
kubeconfig	utoronto	r-staging	Core infrastructure has been modified
aws	jupyter-health	staging	Core infrastructure has been modified
gcp	awi-ciroh	staging	Core infrastructure has been modified
aws	openscapeshub	staging	Core infrastructure has been modified
aws	ucmerced	staging	Core infrastructure has been modified
aws	maap	staging	Core infrastructure has been modified
aws	nasa-cryo	staging	Core infrastructure has been modified
aws	earthscope	staging	Core infrastructure has been modified
aws	disasters	staging	Core infrastructure has been modified
gcp	cloudbank	staging	Core infrastructure has been modified
aws	reflective	staging	Core infrastructure has been modified
aws	nasa-veda	staging	Core infrastructure has been modified
aws	smithsonian	staging	Core infrastructure has been modified
aws	opensci	staging	Core infrastructure has been modified
gcp	2i2c-uk	staging	Core infrastructure has been modified
aws	2i2c-aws-us	staging	Core infrastructure has been modified

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Cloud Provider	Cluster Name	Hub Name	Reason for Redeploy
gcp	leap	prod	Core infrastructure has been modified
gcp	leap	public	Core infrastructure has been modified
aws	berkeley-geojupyter	prod	Core infrastructure has been modified
aws	temple	prod	Core infrastructure has been modified
aws	temple	advanced	Core infrastructure has been modified
aws	temple	research	Core infrastructure has been modified
aws	nasa-ghg-hub	prod	Core infrastructure has been modified
aws	nasa-ghg-hub	binder	Core infrastructure has been modified
aws	aimatx-2i2c-hub	prod	Core infrastructure has been modified
aws	bnext-bio	prod	Core infrastructure has been modified
aws	victor	prod	Core infrastructure has been modified
gcp	2i2c	mtu	Core infrastructure has been modified
aws	nmfs-openscapes	prod	Core infrastructure has been modified
aws	nmfs-openscapes	workshop	Core infrastructure has been modified
aws	nmfs-openscapes	noaa-only	Core infrastructure has been modified
gcp	hhmi	spyglass	Core infrastructure has been modified
gcp	hhmi	binder	Core infrastructure has been modified
aws	projectpythia	prod	Core infrastructure has been modified
aws	projectpythia	pythia-binder	Core infrastructure has been modified
kubeconfig	utoronto	prod	Core infrastructure has been modified
kubeconfig	utoronto	r-prod	Core infrastructure has been modified
kubeconfig	utoronto	highmem	Core infrastructure has been modified
aws	jupyter-health	prod	Core infrastructure has been modified
gcp	awi-ciroh	prod	Core infrastructure has been modified
gcp	awi-ciroh	workshop	Core infrastructure has been modified
gcp	dubois	ephemeral	Core infrastructure has been modified
kubeconfig	projectpythia-binder	binderhub	Core infrastructure has been modified
aws	openscapeshub	prod	Core infrastructure has been modified
aws	openscapeshub	workshop	Core infrastructure has been modified
aws	ucmerced	prod	Core infrastructure has been modified
aws	maap	prod	Core infrastructure has been modified
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aws	earthscope	prod	Core infrastructure has been modified
aws	earthscope	binder	Core infrastructure has been modified
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aws	opensci	sciencecore	Core infrastructure has been modified
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