This container can be pulled via:
  docker pull registry.opensuse.org/opensuse/leap/15.3/arm/images/totest/containers/opensuse/leap-dnf:15.3
  docker pull registry.opensuse.org/opensuse/leap/15.3/arm/images/totest/containers/opensuse/leap-dnf:15.3.2.61

Set DOCKER_CONTENT_TRUST=1 to enable image tag verification.