helm-release: Publish the helm chart as OCI artifact

[marcofranssen]

What this PR does / why we need it:

This PR will ensure whenever a new release of the chart is published it will also be published as OCI.

the chart will be published at ghcr.io/kubernetes-sigs/charts/metrics-server

This is useful for folks that use ECR caching in local regions for faster argocd syncs.

Same is used for couple of years here https://github.com/spiffe/helm-charts-hardened/blob/spire-0.26.1/.github/workflows/helm-release.yaml#L53-L70

Also see kubernetes-sigs/cluster-proportional-autoscaler#268

Note

As the original helm release isn't touched that part of the release will not be affected. Only if the http release succeeds the workflow will try to also publish this OCI release.

The risk therefore is very low.

Which issue(s) this PR fixes (optional, in fixes #<issue number>(, fixes #<issue_number>, ...) format, will close the issue(s) when PR gets merged):

N.A.

[k8s-ci-robot]

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[k8s-ci-robot]

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[dgrisonnet]

/triage accepted
/assign @stevehipwell

[dgrisonnet]

/ok-to-test

[stevehipwell]

Please see #1527.

/hold

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