{
  description = "docker builder for cascade's node-red";

  inputs = {
    nixpkgs.url = "github:nixos/nixpkgs?ref=nixos-unstable";
    flake-utils.url = "github:numtide/flake-utils";
  };

  outputs = { self, nixpkgs, flake-utils }: flake-utils.lib.eachDefaultSystem (system:
    let
    lib = nixpkgs.lib;
    pkgs = nixpkgs.legacyPackages.${system};
    streamImage = pkgs.callPackage (import ./docker.nix) {};
    in
  {

    packages.upload-image = pkgs.writeScriptBin "upload" ''
      ${streamImage} | ${pkgs.skopeo}/bin/skopeo copy docker-archive:/dev/stdin "$@"
    '';

    packages.stream-image = pkgs.writeScriptBin "stream" ''
      ${streamImage}
    '';

    packages.default = pkgs.writeScriptBin "help" ''
      echo ${lib.escapeShellArg ''
        nixos-based docker node-red image builder

        usage:

        nix run .#stream-image | docker load
        nix run .#upload-image docker://registry.where/it/goes:its4tag
        ''}

    '';
  });
}