This container can be pulled via:
  docker pull registry.opensuse.org/home/fcrozat/matryoshka/containerfile/bci/openjdk:16
  docker pull registry.opensuse.org/home/fcrozat/matryoshka/containerfile/bci/openjdk:16.0.2
  docker pull registry.opensuse.org/home/fcrozat/matryoshka/containerfile/bci/openjdk:16.0.2.1.39

Set DOCKER_CONTENT_TRUST=1 to enable image tag verification.