these 2 derivations will be built:
  /nix/store/vkxqbar44zzz01qqbz64jqy4wmrlrmzj-nix-grpc-store-0.1.0-beta.1.drv
  /nix/store/8inbz09j23lsfax6yfymp83v86f2l0zk-nix-grpc-store-exit-stress.drv