Support pushing charts to OCI repos (e.g. ghcr.io), just like images

[bleggett]

Proposed change

Helm charts can be pushed to OCI-compliant repos, just like images can be. Github's container registry ghcr.io supports this, and as of Helm 3.8 this is the default.

This avoids the need to set up Github pages or a special Helm chart repo of any kind.

Alternative options

Who would use this feature?

Anyone publishing images to an OCI registry could also push their charts there.

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