This container can be pulled via:
  docker pull registry.opensuse.org/kubic/etcd:3.5.21
  docker pull registry.opensuse.org/kubic/etcd:3.5.21-0
  docker pull registry.opensuse.org/kubic/etcd:3.5.21-0.8.107
  docker pull registry.opensuse.org/kubic/etcd:3.5.21-1
  docker pull registry.opensuse.org/kubic/etcd:3.5.21-1.8.107
  docker pull registry.opensuse.org/kubic/etcd:latest

Set DOCKER_CONTENT_TRUST=1 to enable image tag verification.