Improve packaging (#328)

* Add gpgui-helper (#326)

* Add packaging

crates/gpapi/src/service/request.rs

@@ -146,3 +146,9 @@ pub enum WsRequest {
   Connect(Box<ConnectRequest>),
   Disconnect(DisconnectRequest),
 }
+
+#[derive(Debug, Deserialize, Serialize)]
+pub struct UpdateGuiRequest {
+  pub path: String,
+  pub checksum: String,
+}