these 2 derivations will be built:
  /nix/store/kmdnfmsfgcpxski1j0h042my0g9v4k87-nix-grpc-store-0.1.0.drv
  /nix/store/mlh0qzps1l34khkc30vij25gfwhlxzfd-nix-grpc-store-exit-stress.drv