This container can be pulled via:
  docker pull registry.opensuse.org/kubevirt/sidecar-shim:1.3.1
  docker pull registry.opensuse.org/kubevirt/sidecar-shim:1.3.1-3.1
  docker pull registry.opensuse.org/kubevirt/sidecar-shim:1.3.1.2.56

Set DOCKER_CONTENT_TRUST=1 to enable image tag verification.