these 2 derivations will be built:
  /nix/store/1q3zmzlp7c1634xlmifq50j518qdbl75-nix-grpc-store-0.1.0-beta.4.drv
  /nix/store/9a9nablhawshl6q6jyqdfi62z88m4j0d-nix-grpc-store-dispatcher.drv