This container can be pulled via:
  docker pull registry.opensuse.org/opensuse/factory/zsystems/totest/containers/opensuse/docker_auth:1.9.0
  docker pull registry.opensuse.org/opensuse/factory/zsystems/totest/containers/opensuse/docker_auth:1.9.0-3.40
  docker pull registry.opensuse.org/opensuse/factory/zsystems/totest/containers/opensuse/docker_auth:latest

Set DOCKER_CONTENT_TRUST=1 to enable image tag verification.