these 2 derivations will be built:
  /nix/store/18wsisl7k8qdxaz1xgzq97z0i561l1fg-nix-grpc-store-0.2.3.drv
  /nix/store/hqaprf7bjcmdvyh4zacarb5l75i6rh0b-nix-grpc-store-exit-stress.drv