these 2 derivations will be built:
  /nix/store/npzjr9mhjdp7gifmcjwp0g4svwqrcwsv-nix-grpc-store-0.2.3.drv
  /nix/store/9ymk4hinxw7rxyjnbxb2hj2xvgfnwm2i-nix-grpc-store-dispatcher.drv