these 2 derivations will be built:
  /nix/store/s3f9qmr56hxjqfg7l9zmflz47ih0gsjd-nix-grpc-store-0.1.0.drv
  /nix/store/nlb9nnzf2y5d73s74k8ifs4l66g7gj20-nix-grpc-store-exit-stress.drv