these 2 derivations will be built:
  /nix/store/5vbyhvgi0kz03dzm0gvj358j1knz3khr-nix-grpc-store-0.2.1.drv
  /nix/store/q0hvj9f5s19jyq9hml30smayi3gb05va-nix-grpc-store-dispatcher.drv