This container can be pulled via:
  docker pull registry.opensuse.org/opensuse/factory/totest/containers/kubevirt/virt-controller:1.4.0
  docker pull registry.opensuse.org/opensuse/factory/totest/containers/kubevirt/virt-controller:1.4.0-1.1
  docker pull registry.opensuse.org/opensuse/factory/totest/containers/kubevirt/virt-controller:1.4.0.9.91

Set DOCKER_CONTENT_TRUST=1 to enable image tag verification.