This container can be pulled via:
  docker pull registry.opensuse.org/opensuse/factory/totest/containers/kubevirt/virt-synchronization-controller:1.6.3
  docker pull registry.opensuse.org/opensuse/factory/totest/containers/kubevirt/virt-synchronization-controller:1.6.3-2.1
  docker pull registry.opensuse.org/opensuse/factory/totest/containers/kubevirt/virt-synchronization-controller:1.6.3.1.7

Set DOCKER_CONTENT_TRUST=1 to enable image tag verification.