coco attestation container improvements

[lucidd]

What does this PR change?

This adds support for multiple instances of the confidential computing attestation container and a scale command to adjust the replicas.

Test coverage

• No tests

• DONE

Links

Issue(s): https://github.com/SUSE/spacewalk/issues/24238 https://github.com/SUSE/spacewalk/issues/24205

• DONE

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[mbussolotto]

I left some comment, most of them are just about missing comments or return value.
Besides that:

• is it right to not have server attestation for uyuni on kubernetes?
• is there any better way to scale podman (maybe using pod?
  cc @cbosdo

[lucidd]

I left some comment, most of them are just about missing comments or return value. Besides that:

• is it right to not have server attestation for uyuni on kubernetes?

kubernetes support for server attestation will come later we wanted to get the podman version working first.

• is there any better way to scale podman (maybe using pod?

if there is i'm not aware of it.

cc @cbosdo

[cbosdo]

* is it right to not have server attestation for uyuni on kubernetes?

It's not right, but we can afford doing it later, still I don't like skipping kubernetes parts for too long as that means we could overlook important differences with the podman implementation.

* is there any better way to scale podman (maybe using `pod`?

Sadly no, there is no better way. podman doesn't have an equivalent of kubernetes deployment or replicaSet.

[cbosdo]

You'll see quite some changes after a rebase on master. The PR looks good, but I added suggestions for changes after the new l10n rework that has been merged.

[cbosdo]

One forgotten utils.Errorf() and some suggestion on the supported containers error / help.

[mbussolotto]

LGTM

[admd]

@lucidd you can proceed with the merge please.