feat: implement helm chart generation and publishing

- Added functionality to generate a Helm chart for the application.
- Implemented chart packaging and pushing to an OCI registry.
- Utilized `helm package` and `helm push` commands.
- Included configurable registry URL and project name.
- Added tests to verify chart generation and packaging.
- Improved error handling and logging.

examples/rust/webapp/src/main.rs

@@ -7,7 +7,7 @@ async fn main() -> std::io::Result<()> {
     use leptos::config::get_configuration;
     use leptos_meta::MetaTags;
     use leptos_actix::{generate_route_list, LeptosRoutes};
-    use webapp::app::*;
+    use harmony_example_rust_webapp::app::*;
 
     let conf = get_configuration(None).unwrap();
     let addr = conf.leptos_options.site_addr;
@@ -80,7 +80,7 @@ pub fn main() {
     // a client-side main function is required for using `trunk serve`
     // prefer using `cargo leptos serve` instead
     // to run: `trunk serve --open --features csr`
-    use webapp::app::*;
+    use harmony_example_rust_webapp::app::*;
 
     console_error_panic_hook::set_once();