print XDG_DATA_DIRS in fitnesstrax

fitnesstrax/app/src/main.rs

@@ -58,6 +58,8 @@ fn setup_app_close_action(app: &adw::Application) {
 }
 
 fn main() {
+    println!("XDG_DATA_DIR: {}", std::env::var("XDG_DATA_DIR").unwrap_or("".to_owned()));
+
     // I still don't fully understand gio resources. resources_register_include! is convenient
     // because I don't have to deal with filesystem locations at runtime. However, I think other
     // GTK applications do that rather than compiling the resources directly into the app. So, I'm