Support pushing charts to OCI registries

There are several hosted container registries with OCI support that you can use for your Helm charts. For example:

[Amazon ECR](https://docs.aws.amazon.com/AmazonECR/latest/userguide/push-oci-artifact.html)
[Azure Container Registry](https://docs.microsoft.com/azure/container-registry/container-registry-helm-repos#push-chart-to-registry-as-oci-artifact)
[Docker Hub](https://docs.docker.com/docker-hub/oci-artifacts/)
[Google Artifact Registry](https://cloud.google.com/artifact-registry/docs/helm/manage-charts)
[Harbor](https://goharbor.io/docs/main/administration/user-defined-oci-artifact/)
[IBM Cloud Container Registry](https://cloud.ibm.com/docs/Registry?topic=Registry-registry_helm_charts)
[JFrog Artifactory](https://jfrog.com/help/r/jfrog-artifactory-documentation/helm-oci-repositories)

Documentation: https://helm.sh/docs/topics/registries/

## Acceptance Criteria
- Add integration test that pushes a chart into any of the above OCI registries
- Update documentation if needed

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Support pushing charts to OCI registries #371

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