these 2 derivations will be built:
  /nix/store/cymscvq0l6g8j49jw0kh9wicam227g2b-nix-grpc-store-0.2.1.drv
  /nix/store/3w48sgxf966s7jvpl12clkxmi7j7cyws-nix-grpc-store-dispatcher.drv