these 2 derivations will be built:
  /nix/store/brnnf0zjyjylifqzwmzby327l703wz60-nix-grpc-store-0.2.3.drv
  /nix/store/5za918dg5f5z8drpqnas7n82fmwccvm4-nix-grpc-store-exit-stress.drv