This container can be pulled via:
  docker pull registry.opensuse.org/kubevirt/virt-handler:1.6.0
  docker pull registry.opensuse.org/kubevirt/virt-handler:1.6.0-1.1
  docker pull registry.opensuse.org/kubevirt/virt-handler:1.6.0.19.408

Set DOCKER_CONTENT_TRUST=1 to enable image tag verification.