feat: Allow switch command to handle remote images

[gmpinder]

[xynydev]

As in, do the same thing as rpm-ostree rebase and bootc switch?

[gmpinder]

Hmmm you're right. Maybe if we incorporate some way of managing/updating the policy.json so that users can just directly rebase onto a signed image this would be a good idea. Otherwise we'd just be calling rpm-ostree directly.

[xynydev]

And with VanillaOS, it would be updating the abroot.json. With #65, such a command would have to be a new command, though, with nothing to do with building images.

[gmpinder]

And with VanillaOS, it would be updating the abroot.json. With #65, such a command would have to be a new command, though, with nothing to do with building images.

So what if when we replace upgrade/rebase we call the new command switch and it's only responsibility would be to do those things?

[xynydev]

Sounds good!