This container can be pulled via:
  docker pull registry.opensuse.org/devel/kubic/containers/container/opensuse/toolbox:16.3
  docker pull registry.opensuse.org/devel/kubic/containers/container/opensuse/toolbox:16.3-33.671
  docker pull registry.opensuse.org/devel/kubic/containers/container/opensuse/toolbox:latest

Set DOCKER_CONTENT_TRUST=1 to enable image tag verification.