This container can be pulled via:
  docker pull registry.opensuse.org/opensuse/factory/zsystems/totest/containers/opensuse/cosign:3
  docker pull registry.opensuse.org/opensuse/factory/zsystems/totest/containers/opensuse/cosign:3.1
  docker pull registry.opensuse.org/opensuse/factory/zsystems/totest/containers/opensuse/cosign:3.1.1
  docker pull registry.opensuse.org/opensuse/factory/zsystems/totest/containers/opensuse/cosign:3.1.1-27.4
  docker pull registry.opensuse.org/opensuse/factory/zsystems/totest/containers/opensuse/cosign:latest

Set DOCKER_CONTENT_TRUST=1 to enable image tag verification.