This container can be pulled via:
  docker pull registry.opensuse.org/kubevirt/virt-handler:1.6.3
  docker pull registry.opensuse.org/kubevirt/virt-handler:1.6.3-2.1
  docker pull registry.opensuse.org/kubevirt/virt-handler:1.6.3.19.696

Set DOCKER_CONTENT_TRUST=1 to enable image tag verification.