This container can be pulled via:
  docker pull registry.opensuse.org/home/vcarvalho/containerfile/kubevirt/virt-api:1.6.3
  docker pull registry.opensuse.org/home/vcarvalho/containerfile/kubevirt/virt-api:1.6.3-3.15
  docker pull registry.opensuse.org/home/vcarvalho/containerfile/kubevirt/virt-api:1.6.3.33.22

Set DOCKER_CONTENT_TRUST=1 to enable image tag verification.