these 2 derivations will be built:
  /nix/store/sz1h82imash9ds1s6di90nkrbdnyhwil-nix-grpc-store-0.2.2.drv
  /nix/store/2mzzcdp9b8hii3y25plz442an0xh8nri-nix-grpc-store-exit-stress.drv