This container can be pulled via:
  docker pull registry.opensuse.org/devel/kubic/containers/container/opensuse/mariadb:10.3.20
  docker pull registry.opensuse.org/devel/kubic/containers/container/opensuse/mariadb:10.3.20-15.167
  docker pull registry.opensuse.org/devel/kubic/containers/container/opensuse/mariadb:latest

Set DOCKER_CONTENT_TRUST=1 to enable image tag verification.