these 2 derivations will be built:
  /nix/store/knajkkmycyg2wcvmn8ssjcr5vqf97j8s-nix-grpc-store-0.2.2.drv
  /nix/store/j3ajr523cahk1hcrfdcdj4i99sm0b26w-nix-grpc-store-exit-stress.drv