these 2 derivations will be built:
  /nix/store/8iw78cpdlynic808hd2hijvdr82djkkh-nix-grpc-store-0.2.1.drv
  /nix/store/0zq3qbvjwgb2w1p1iyd7ywxgcb1k70q9-nix-grpc-store-exit-stress.drv