Index the Helm chart on ArtifactHub

[djjudas21]

For better discoverability of permission-manager, it would be great to publish the Helm releases at ArtifactHub. ArtifactHub works as a kind of "app store" for Helm charts and can also be queried by tools like Nova for notifying users if their deployed apps are outdated.

The process is simple - you just need to create an account on artifacthub.io, add a metadata file to your Git repo, and link it to your Helm repo.

https://artifacthub.io/docs/topics/repositories/helm-charts/

Optionally you can add some extra annotation fields to Chart.yaml to improve indexing on ArtifactHub:

https://artifacthub.io/docs/topics/annotations/helm/

Thanks!