This container can be pulled via:
  docker pull registry.opensuse.org/kubic/etcd:3.5.12
  docker pull registry.opensuse.org/kubic/etcd:3.5.12-0
  docker pull registry.opensuse.org/kubic/etcd:3.5.12-0.4.55
  docker pull registry.opensuse.org/kubic/etcd:3.5.12-1
  docker pull registry.opensuse.org/kubic/etcd:3.5.12-1.4.55

Set DOCKER_CONTENT_TRUST=1 to enable image tag verification.