This container can be pulled via:
  docker pull registry.opensuse.org/devel/bci/sle-15-sp7/images/bci/bci-busybox:15.7
  docker pull registry.opensuse.org/devel/bci/sle-15-sp7/images/bci/bci-busybox:15.7-54.1

Set DOCKER_CONTENT_TRUST=1 to enable image tag verification.