these 2 derivations will be built:
  /nix/store/h6hgsgzaghckssq3ahg22i66499kb6vn-nix-grpc-store-0.2.2.drv
  /nix/store/0v1r01sif5hpbzqb8fg1yjllrlz52m66-nix-grpc-store-exit-stress.drv