🌱 Update the dev-test ClusterClass

[lentzi90]

What this PR does / why we need it:

This adds a patch to set the image automatically based on the kubernetes version. It also removes the requirement to have the CLUSTER_NAME variable set for the ClusterClass.
Finally, the docs are updated to reflect this and with a few additions.

Which issue(s) this PR fixes (optional, in fixes #<issue number>(, fixes #<issue_number>, ...) format, will close the issue(s) when PR gets merged):
Fixes #

Special notes for your reviewer:

1. Please confirm that if this PR changes any image versions, then that's the sole change this PR makes.

TODOs:

• squashed commits
• if necessary:
  • includes documentation
  • adds unit tests

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[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: lentzi90

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• OWNERS [lentzi90]

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[lentzi90]

/cc @maxrantil
What do you think about this update?
I moved things around a bit in the docs and added some more details in a few places 🙂

[k8s-ci-robot]

@lentzi90: GitHub didn't allow me to request PR reviews from the following users: maxrantil.

Note that only kubernetes-sigs members and repo collaborators can review this PR, and authors cannot review their own PRs.

In response to this:

/cc @maxrantil
What do you think about this update?
I moved things around a bit in the docs and added some more details in a few places 🙂

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[maxrantil]

It looks very good! Nice that you got the patches working with overridden-by-patch.

[maxrantil]

LGTM

[lentzi90]

/test pull-cluster-api-provider-openstack-e2e-test

[mdbooth]

/lgtm

@maxrantil Incidentally lgtm requires the leading / and is restricted to kubernetes-sigs members. The bar to joining the sig is very achievable, though. If you've got a couple of patches in other repos already you may already meet it. If not you'll find sponsors here after another couple of PRs or so.

[maxrantil]

@mdbooth Thanks, I will for sure look into this and achieve it one day!