these 2 derivations will be built:
  /nix/store/9m9a24wdwsrf816515yy0g9chi9zsvrm-nix-grpc-store-0.2.3.drv
  /nix/store/z4bcv6db70rjnsbz7qy0qpa7vkp1g17b-nix-grpc-store-dispatcher.drv