nixos-config/configs/home-manager/foo-dogsquared/files/homepage/shell.nix

{ pkgs ?
  import <nixpkgs> { overlays = [ (import ../../../../../overlays).default ]; }
}:

let site = pkgs.callPackage ./package.nix { };
in pkgs.mkShell {
  inputsFrom = [ site ];
  packages = with pkgs; [ treefmt npins ];
}