these 2 derivations will be built:
  /nix/store/sz1h82imash9ds1s6di90nkrbdnyhwil-nix-grpc-store-0.2.2.drv
  /nix/store/cw3arslym1pzs82mx7c30s7ibxrkpgm9-nix-grpc-store-dispatcher.drv