This container can be pulled via:
  docker pull registry.opensuse.org/isv/suse/edge/sles16.1/charts/metal3:306.0.28_up0.15.0
  docker pull registry.opensuse.org/isv/suse/edge/sles16.1/charts/metal3:306.0.28_up0.15.0-2.5

Set DOCKER_CONTENT_TRUST=1 to enable image tag verification.