rules_oci support

### Description of the problem / feature request:

support rules_oci images substituting images into a k8s_deploy.

### Feature requests: what underlying problem are you trying to solve with this feature?

rules_docker is deprecated and in minimal maintenance mode. rules_oci appears to be its successor. It would be great if we could support rules_oci.

While rules_oci is the successor to rules_docker, it's not a drop in replacement, so it will be a non-trivial and breaking change.

It's unclear whether a fork is the right answer in the short term until all the users of rules_gitops move away from rules_docker and move to rules_oci.

Let me know if this is something people are thinking about.

Das Issue nennt k8s_deploy, rules_docker und rules_oci, aber keine Dateien oder Tests. Beginne damit, die bestehende rules_docker-Integration zu finden und die rules_oci-Schnittstelle zu vergleichen; kläre, ob die Unterstützung hier oder in einem Fork erfolgen sollte, und definiere anschließend den Migrationspfad für die Breaking Change sowie die Akzeptanzkriterien für das Einsetzen von rules_oci-Images in k8s_deploy.

Vom Indexierungsmodell aus dem Issue-Text verfasst.