these 2 derivations will be built:
  /nix/store/hcmqh7zp7xs65jvsxpnx93499kw55p4m-nix-grpc-store-0.2.2.drv
  /nix/store/wpncm2pz91zbzg125c462qzbvzxpmn2m-nix-grpc-store-dispatcher.drv