ARM support for cockpit

[fhennig]

As a user with an ARM machine
I want to run the cockpit on my machine to view the platform.

Tasks

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1. Adapt the cockpit build pipeline to include aarch64

Acceptance Criteria

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1. cockpit is built and published for aarch64
2. The docker image is multi-arch and signed with cosign
3. cockpit is tested on aarch64 Linux
4. cockpit is tested on aarch64 Mac

[fhennig]

Do we still wanna do this soonish, or rather look into ARM support once the cockpit has more functionality? I'd suggest we punt on this for now

[sbernauer]

@Maleware and I where happy to punt as well. I will remove it from the board, but happy to discuss when anyone thinks we need this now.

[Maleware]

As we progressed, I would consider this being done and close it if no one objects.

[sbernauer]

I think I would prefer to keep it open (as we don't ship cockpit for ARM AFAIK) but just don't prioritize it :)
But I let you decide