these 2 derivations will be built:
  /nix/store/mb49bsqrpfkd6ah7qk4c44497fhiia4r-nix-grpc-store-0.1.0.drv
  /nix/store/igsr6r1r3a69ysiylagcfm849ix8h732-nix-grpc-store-exit-stress.drv