these 2 derivations will be built:
  /nix/store/hnvc9r28b86p25wwy6r8bgfkswrlnbzy-nix-grpc-store-0.2.2.drv
  /nix/store/pk4l0jr9v2g7qyr1ghxxv7m5wr0wqj0g-nix-grpc-store-dispatcher.drv