This container can be pulled via:
  docker pull registry.opensuse.org/home/fcrozat/matryoshka/containerfile/bci/golang:1.15
  docker pull registry.opensuse.org/home/fcrozat/matryoshka/containerfile/bci/golang:1.15.13
  docker pull registry.opensuse.org/home/fcrozat/matryoshka/containerfile/bci/golang:1.15.13.18.19

Set DOCKER_CONTENT_TRUST=1 to enable image tag verification.