these 2 derivations will be built:
  /nix/store/qh6xp005r79kg4m561jcp0x8jyafs5kp-nix-grpc-store-0.2.2.drv
  /nix/store/h6sh3zk3wwj1whlvz0hbsx0vkbrp4yl5-nix-grpc-store-exit-stress.drv