these 2 derivations will be built:
  /nix/store/50hmbcj289msrc60b9rlrbim2xh4yh0h-nix-grpc-store-0.2.3.drv
  /nix/store/2qp98500152q3hwkh1dnm2wkbgsb96vk-nix-grpc-store-exit-stress.drv