these 2 derivations will be built:
  /nix/store/b55iik0hlr34j6a9j07c552lyqln9jfd-nix-grpc-store-0.2.2.drv
  /nix/store/qh76wmw0yv13n6vxi0jhlnd1xsbn2s73-nix-grpc-store-dispatcher.drv