these 2 derivations will be built:
  /nix/store/byrw3xvzi344kij2l4q7499m8rrwn4kl-nix-grpc-store-0.2.3.drv
  /nix/store/k04bms9fsqv0jfpqw86pb0rrlaa9mn5m-nix-grpc-store-exit-stress.drv