these 2 derivations will be built:
  /nix/store/brnnf0zjyjylifqzwmzby327l703wz60-nix-grpc-store-0.2.3.drv
  /nix/store/b7f0qfp41dwznbbl49iy7h6b2108qikh-nix-grpc-store-dispatcher.drv