feat: Support dynamic image repositories

[Techassi]

Part of stackabletech/issues#716.

[sbernauer]

I'd argue this is a breaking change (you need to pass a new CLI flag or env var) and should be noted in the changelog

[lfrancke]

This does not have release notes. I assume the parent will. Those should then mention the breaking change. Are all operators the same? As in: Is it a breaking change in all of them?

[Techassi]

I assume the parent will. Those should then mention the breaking change.

Yes, I will add release notes to stackabletech/issues#716.

Are all operators the same? As in: Is it a breaking change in all of them?

Yes, all. The core operators also have it even tho they technically don't need the argument. We could customize the CLI if we really want to avoid adding an used CLI argument. I didn't do this as part of the initial work, as it already took long enough to be done.

EDIT: Here are the release notes: stackabletech/issues#716 (comment)