these 2 derivations will be built:
  /nix/store/9j71s6vb96438xj223gqh4rws4vsssb2-nix-grpc-store-0.2.3.drv
  /nix/store/4j0jcxf7wg20gc88nipk64ng6ihsdfc9-nix-grpc-store-exit-stress.drv