This container can be pulled via:
  docker pull registry.opensuse.org/devel/caasp/kubic-container/container/kubic/salt-master:2018.3
  docker pull registry.opensuse.org/devel/caasp/kubic-container/container/kubic/salt-master:2018.3.2
  docker pull registry.opensuse.org/devel/caasp/kubic-container/container/kubic/salt-master:2018.3.2-16.26

Set DOCKER_CONTENT_TRUST=1 to enable image tag verification.