This container can be pulled via:
  docker pull registry.opensuse.org/devel/bci/tumbleweed/containerfile/opensuse/cosign:3
  docker pull registry.opensuse.org/devel/bci/tumbleweed/containerfile/opensuse/cosign:3.1
  docker pull registry.opensuse.org/devel/bci/tumbleweed/containerfile/opensuse/cosign:3.1.1
  docker pull registry.opensuse.org/devel/bci/tumbleweed/containerfile/opensuse/cosign:3.1.1-257.3
  docker pull registry.opensuse.org/devel/bci/tumbleweed/containerfile/opensuse/cosign:latest

Set DOCKER_CONTENT_TRUST=1 to enable image tag verification.