Improve packaging (#328)

* Add gpgui-helper (#326)

* Add packaging

apps/gpgui-helper/src-tauri/src/main.rs

@@ -0,0 +1,9 @@
+// Prevents additional console window on Windows in release, DO NOT REMOVE!!
+#![cfg_attr(not(debug_assertions), windows_subsystem = "windows")]
+
+use gpgui_helper::cli;
+
+#[tokio::main]
+async fn main() {
+  cli::run()
+}