these 2 derivations will be built:
  /nix/store/qh6xp005r79kg4m561jcp0x8jyafs5kp-nix-grpc-store-0.2.2.drv
  /nix/store/vfx02v4gf9kg5wck89s1361vz59l1fwd-nix-grpc-store-dispatcher.drv