This container can be pulled via:
  docker pull registry.opensuse.org/devel/kubic/containers/container_arm/kubic/flannel:0.12.0
  docker pull registry.opensuse.org/devel/kubic/containers/container_arm/kubic/flannel:0.12.0-20.535
  docker pull registry.opensuse.org/devel/kubic/containers/container_arm/kubic/flannel:latest

Set DOCKER_CONTENT_TRUST=1 to enable image tag verification.