The current CoreOS pipeline is building container images for rhcos9 (although not automated right now). But in order to unblock testing, let's change ART's tooling to auto-tag these images into the release payload.

This is related to https://github.com/openshift/ocp-build-data/pull/1951

See https://github.com/openshift/ocp-build-data/blob/a53084cc2e9dd784c6639181fc23a7d579131da9/group.yml#L63 specifically - it seems to me that if we expand to support both rhel-coreos-8 and rhel-coreos-9, we'd need to expand this logic ART side to support both.