Make publishing plugins easier

[joaquimrocha]

Is your feature request related to a problem? Please describe the impact that the lack of the feature requested is creating.

More and more people are asking for how to deploy Headlamp with plugins. This has been kind of a manual process, but for the Flux UI we do publish an OCI image.

We do have a Dockerfile for building a plugin OCI which makes it easy already, but we could make it easier by having a release process to make it easier.

Describe the solution you'd like

I would like to have:

• A script to build both the OCI and the plugin tarball, so they would be ready to push to Github
• A Github action (on headlamp-k8s/plugins) for manually releasing a plugin. This should:
  • Build the tarball
  • Build the OCI (if the ArtifactHub pkg file has the in-cluster tag)
  • Push the OCI to the registry
  • Push the tarball to a draft release (see the push-release-assets.js script in headlamp)
  • Update the ArtifactHub pkg file for that plugin

What users will benefit from this feature?

Us maintainers and anyone looking for creating their own plugin repo.

Are you able to implement this feature?

I prefer to delegate 😄

[sniok]

I think another way that might be convenient is to allow enabling a plugin from artifacthub via cli option, something like
./headlamp --plugin-url https://artifacthub.io/packages/headlamp/headlamp-plugins/headlamp_flux
the same thing you could put into "extraArgs" helm chart value

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