these 2 derivations will be built:
  /nix/store/nrqqa90inp0yhywjy041xq5334866c5b-nix-grpc-store-0.1.0-beta.4.drv
  /nix/store/bjag4z4avcd9vvxakafd87l38gjd7xj5-nix-grpc-store-exit-stress.drv