! exec devbox run hello
exec devbox add path:my-flake

exec devbox run hello

-- devbox.json --
{
  "packages": [
  ]
}

-- my-flake/flake.nix --
{
  description = "Test";

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

  outputs = { self, nixpkgs, flake-utils }:
    flake-utils.lib.eachDefaultSystem (system:
      let
        pkgs = nixpkgs.legacyPackages.${system};
      in
      {
        packages = {
          default = pkgs.hello;
        };
      });
}
