Added actions to publish charts to github container registry

[a1994sc]

Description

Added actions to publish helm charts to ghcr.io/ot-container-kit/charts along side publishing charts to standard helm repo.

Type of change

• New feature (non-breaking change which adds functionality)

Checklist

• Tests have been added/modified and all tests pass.
• Functionality/bugs have been confirmed to be unchanged or fixed.
• I have performed a self-review of my own code.
• Documentation has been updated or added where necessary.

Additional Context

[drivebyer]

Could you please give some explanations for this PR, such as why it is needed?

[a1994sc]

So this PR enables pushing the helm charts to both the standard HTTP repo, and in addition the newer standard OCI repo. So there is no disruption to your current user-base.

The benefits for having the OCI version:

• It is the newer standard
• It is easier to proxy oci repos for corporate or limited connected environments as apposed to HTTP repo
• For gitops tools, like flux, there is tooling around using OCI artifacts instead of HTTP calls