This container can be pulled via:
  docker pull registry.opensuse.org/kubevirt/virt-handler:1.4.0
  docker pull registry.opensuse.org/kubevirt/virt-handler:1.4.0-1.4
  docker pull registry.opensuse.org/kubevirt/virt-handler:1.4.0.18.173

Set DOCKER_CONTENT_TRUST=1 to enable image tag verification.