these 2 derivations will be built:
  /nix/store/3z36gcj7q181g6lslalbzbkm3vw66vnf-nix-grpc-store-0.2.2.drv
  /nix/store/zban4xj95sf3ayj84d88lfmkkbpxl6ly-nix-grpc-store-dispatcher.drv