Is your feature request related to a problem? Please describe.

Currently, only the x86_64 architecture is tested.

Describe the solution you would like

Also add support for arm64. Most (all?) OSes in the test matrix also have official arm64 AMIs available. K0s is already tested on arm64 in CI and during the release pipeline. Might make sense to also have this in the OS tests.

Describe alternatives you've considered

Don't support arm64. That'd be a new dimension and there'd be a bit of a combinatorial explosion.

Additional context

We cloud also opt to add support for the architecture, but not to add it to the nightly testing matrix selection. That way, we'd keep the combinations a bit lower, but could still trigger it on demand.