This container can be pulled via:
  docker pull registry.opensuse.org/devel/kubic/containers/container/kubic/flannel:0.9
  docker pull registry.opensuse.org/devel/kubic/containers/container/kubic/flannel:0.9.1
  docker pull registry.opensuse.org/devel/kubic/containers/container/kubic/flannel:0.9.1-4.55

Set DOCKER_CONTENT_TRUST=1 to enable image tag verification.