This container can be pulled via:
  docker pull registry.opensuse.org/devel/kubic/containers/container/kubic/etcd:3.6.8
  docker pull registry.opensuse.org/devel/kubic/containers/container/kubic/etcd:3.6.8-0
  docker pull registry.opensuse.org/devel/kubic/containers/container/kubic/etcd:3.6.8-0.14.567
  docker pull registry.opensuse.org/devel/kubic/containers/container/kubic/etcd:3.6.8-1
  docker pull registry.opensuse.org/devel/kubic/containers/container/kubic/etcd:3.6.8-1.14.567

Set DOCKER_CONTENT_TRUST=1 to enable image tag verification.