these 2 derivations will be built:
  /nix/store/1pf0wda10c2lra4l2nk0fhv7mplq7irc-nix-grpc-store-0.1.0.drv
  /nix/store/4bp9w3bsrhzg27437qsjsz2rwlahz0f5-nix-grpc-store-dispatcher.drv