This container can be pulled via:
  docker pull registry.opensuse.org/home/steven.hardy/testing/metal3/ironic/master/containerfile/suse/ironic:23.1.1
  docker pull registry.opensuse.org/home/steven.hardy/testing/metal3/ironic/master/containerfile/suse/ironic:latest

Set DOCKER_CONTENT_TRUST=1 to enable image tag verification.