these 2 derivations will be built:
  /nix/store/cym3a5kj5wf2g4bm3xk0mh1bd9whsk1g-nix-grpc-store-0.1.0-beta.4.drv
  /nix/store/5aki75sfppvpjm0fnds0frkxbysld5vf-nix-grpc-store-exit-stress.drv