This container can be pulled via:
  docker pull registry.opensuse.org/kubic/etcd:3.5.16
  docker pull registry.opensuse.org/kubic/etcd:3.5.16-0
  docker pull registry.opensuse.org/kubic/etcd:3.5.16-0.3.37
  docker pull registry.opensuse.org/kubic/etcd:3.5.16-1
  docker pull registry.opensuse.org/kubic/etcd:3.5.16-1.3.37

Set DOCKER_CONTENT_TRUST=1 to enable image tag verification.