This container can be pulled via:
  docker pull registry.opensuse.org/isv/suse/edge/containers/charts/metal3:999.0.21_up0.13.0
  docker pull registry.opensuse.org/isv/suse/edge/containers/charts/metal3:999.0.21_up0.13.0-214.1

Set DOCKER_CONTENT_TRUST=1 to enable image tag verification.