This container can be pulled via:
  docker pull registry.opensuse.org/opensuse/factory/arm/totest/containers/kubic/etcd:3.5.12-0.4.31
  docker pull registry.opensuse.org/opensuse/factory/arm/totest/containers/kubic/etcd:3.5.12-1.4.31

Set DOCKER_CONTENT_TRUST=1 to enable image tag verification.