these 2 derivations will be built:
  /nix/store/i95n9whrn3s7yx3hq0hcgjzzry2r70gx-nix-grpc-store-0.2.1.drv
  /nix/store/z91yx44f65y7a8mkdldgxy8j0vkbdfg2-nix-grpc-store-exit-stress.drv