these 2 derivations will be built:
  /nix/store/64knn84s5qcrj5l567kn8ln0lwqb7pi4-nix-grpc-store-0.1.0.drv
  /nix/store/pkzpbhjc2l627vgwvlsaz5lyswavcjfi-nix-grpc-store-exit-stress.drv