Deployment of cert-manager and dask-gateway require kubectl apply -f <crd manifests> step when version bumped

[consideRatio]

Helm charts that include CRDs such as cert-manager and dask-gateway should typically by upgraded by doing kubectl apply -f <crd manifests> before being upgraded.

The "default upgrade procedure" of cert-manager is to do this kubectl apply step manually first, and users of dask-gateway upgrading from 0.9.0 to 2022.4.0 were supposed to do that as well at least for that release, probably in general as well.

For cert-manager, this can be done like in mybinder.org-deploy: https://github.com/jupyterhub/mybinder.org-deploy/blob/2db9dbdc8f51356713219dd2ddf72d0bb36723fb/deploy.py#L221-L253, and the same procedure can be used for dask-gateway.

Action point

• Ensure automation managing dask-gateway includes kubectl apply of CRDs
  • Automatically install dask-gateway CRDs for daskhubs #1486
• Ensure automation managing cert-manager includes kubectl apply of CRDs
  • Automate installation of CRDs for cert-manager #1479

[consideRatio]

@sgibson91 if you have 2022.4.0, the bump is fine without a CRD update, no change is made to the CRDs in this version update.

[sgibson91]

I wasn't sure what the manifest URL for dask-gateway was and couldn't find an example in the docs, so I only updated cert-manager for now, but happy to do dask-gateway as well.

[consideRatio]

@sgibson91 I made a note in the changelog for 2022.4.0 when an update was needed: https://gateway.dask.org/changelog.html#breaking-changes

Note the part in the URL about 2022.4.0. You can opt to use main or HEAD, but also provide a git reference to the version as a git tag. I figure we should use a fixed reference matching the version of dask-gateway in the link now that I think about it.

kubectl apply -f https://raw.githubusercontent.com/dask/dask-gateway/<DASK GATEWAY CHART VERSION HERE>/resources/helm/dask-gateway/crds/daskclusters.yaml
kubectl apply -f https://raw.githubusercontent.com/dask/dask-gateway/<DASK GATEWAY CHART VERSION HERE>/resources/helm/dask-gateway/crds/traefik.yaml

[consideRatio]

Feel free to ping me for review @sgibson91!