these 2 derivations will be built:
  /nix/store/8v693fgl4lwavy0szi0il7fjdqnwb8af-nix-grpc-store-0.2.0.drv
  /nix/store/ppjz8a7k7hgixn1khxn2knav9rjksiv5-nix-grpc-store-exit-stress.drv