these 2 derivations will be built:
  /nix/store/p5b1fmi76l6dhbbqlzyilrca82s4116y-nix-grpc-store-0.2.3.drv
  /nix/store/6bap4fwx1ggsvvsb7azfhibjcwfbmddw-nix-grpc-store-exit-stress.drv