🌱 Implement single-node cluster self-hosted upgrade test

[chrischdi]

What this PR does / why we need it:

Adds an E2E test for Single Node Cluster (1x control-plane, 0x workers) self-hosted scale-out upgrades.

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 #7230

[chrischdi]

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[chrischdi]

/test pull-cluster-api-apidiff-main
/test pull-cluster-api-e2e-full-main
/test pull-cluster-api-e2e-informing-ipv6-main
/test pull-cluster-api-e2e-informing-main
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[fabriziopandini]

Great to seems multiple efforts coming together so nicely!
/lgtm
I'll defer to @sbueringer and @killianmuldoon to consider if to move also this patch into our runtime extensions (now or in a follow up PR)

[sbueringer]

I'll defer to @sbueringer and @killianmuldoon to consider if to move also this patch into our runtime extensions (now or in a follow up PR)

We could do it and this would require changes to the clusterclass-quick-start.yaml ClusterClass (to add the variable) and to the test extension.

Given that I wouldn't run a test specifically for Runtime SDK + SNC the only benefit would be to keep the two ClusterClasses relatively similar. Given there is already significant drift and the RuntimeSDK clusterclass is only used for 1 e2e test I don't think it's worth the effort.

Nice work!

[chrischdi]

I'll defer to @sbueringer and @killianmuldoon to consider if to move also this patch into our runtime extensions (now or in a follow up PR)

We could do it and this would require changes to the clusterclass-quick-start.yaml ClusterClass (to add the variable) and to the test extension.

Given that I wouldn't run a test specifically for Runtime SDK + SNC the only benefit would be to keep the two ClusterClasses relatively similar. Given there is already significant drift and the RuntimeSDK clusterclass is only used for 1 e2e test I don't think it's worth the effort.

Nice work!

Thx 🎉

Don't I already change the mentioned clusterclass-quick-start.yaml anyways?
But also a good point: should we even use clusterclass for this test (this way we could prevent adding the variable)?

[sbueringer]

@chrischdi Sorry that was the wrong one. I meant clusterclass-quick-start-runtimesdk.yaml.

But also a good point: should we even use clusterclass for this test (this way we could prevent adding the variable)?

I prefer your current version. Essentially by doing this test with ClusterClass we just have more coverage compared to doing it without ClusterClass.

[sbueringer]

/approve

Thank you very much!!

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[Ankitasw]

Thanks a lot @chrischdi for doing this ❤️

[Vijayakumar0328]

Thanks a lot..