This container can be pulled via:
  docker pull registry.opensuse.org/opensuse/factory/riscv/images/opensuse/toolbox:16.3
  docker pull registry.opensuse.org/opensuse/factory/riscv/images/opensuse/toolbox:16.3-11.1601
  docker pull registry.opensuse.org/opensuse/factory/riscv/images/opensuse/toolbox:latest

Set DOCKER_CONTENT_TRUST=1 to enable image tag verification.