Allow releasing to a different repository

[prsnca]

We have a private repository and we want to publish the Helm chart only to a different public repository.

Right now, the owner and the repo are being set from the $GITHUB_REPOSITORY environment variable, which cannot be overridden - https://docs.github.com/en/actions/learn-github-actions/variables#default-environment-variables Also this setting does not allow to set the owner and the repo using the optional config.yaml (cr prefers the given argument and not the yaml value).