these 2 derivations will be built:
  /nix/store/x0256g70f567ipraczdp5hbk4xaji6wg-nix-grpc-store-0.1.0-beta.4.drv
  /nix/store/zl19ag54sb4p5gidrvibavakbfgphrm5-nix-grpc-store-exit-stress.drv