This container can be pulled via:
  docker pull registry.opensuse.org/home/ldevulder/branches/uc-riscv64/containers/elemental3ctl:0_5.1-5.1
  docker pull registry.opensuse.org/home/ldevulder/branches/uc-riscv64/containers/elemental3ctl:latest

Set DOCKER_CONTENT_TRUST=1 to enable image tag verification.