feat(example): added an example of packaging a rust app from github

examples/rust/src/main.rs

@@ -19,8 +19,9 @@ async fn main() {
     let application = Arc::new(RustWebapp {
         name: "harmony-example-rust-webapp".to_string(),
         domain: Url::Url(url::Url::parse("https://rustapp.harmony.example.com").unwrap()),
-        project_root: PathBuf::from("./webapp"), // Relative from 'harmony-path' param
+        project_root: PathBuf::from("./webapp"),
         framework: Some(RustWebFramework::Leptos),
+        service_port: 3000,
     });
 
     let discord_receiver = DiscordWebhook {