Publish Helm chart to OCI registry

[kasefuchs]

Summary

As homelab/cluster administrator
I want Helm chart to be published to an OCI registry
So that I can keep a consistent OCI-based workflow for Helm releases

Context

I’m using FluxCD in my homelab and mostly rely on OCIRepository sources for Helm releases.

Right now K8up chart is only available through the Helm repo, so using it in OCI-based workflow requires mirroring.

It would be really nice if the chart was also published to an OCI registry, similar to how many other projects distribute Helm charts today.

Out of Scope

• Replacing the current Helm repository
• Changing the existing installation workflow

Further links

• https://helm.sh/docs/topics/registries/
• https://docs.sigstore.dev/cosign/signing/other_types/
• https://fluxcd.io/flux/components/source/ocirepositories/

Acceptance Criteria

• New chart releases are also published to an OCI registry
• Chart can be installed via helm install using OCI URL
• OCI artifact is signed and can be verified with Cosign

Implementation Ideas

No response