these 2 derivations will be built:
  /nix/store/d3v9ba2r8g169lk9yjqhs9l2xgksmp05-nix-grpc-store-0.2.2.drv
  /nix/store/wc4izhicq725hwb7a1qhvwfhwg5v9afk-nix-grpc-store-exit-stress.drv