these 2 derivations will be built:
  /nix/store/n9xxbgbj662jig107b35vnssdh5vbmk1-nix-grpc-store-0.2.1.drv
  /nix/store/2560zpjx0p72w3jhl7icgiyri5wa4dyw-nix-grpc-store-exit-stress.drv