Add rust web server

rust-backend/.gitignore

@@ -0,0 +1,2 @@
+target
+

rust-backend/Cargo.toml

@@ -0,0 +1,8 @@
+[package]
+name = "skantravels"
+version = "0.1.0"
+edition = "2021"
+
+[dependencies]
+actix-web = "4"
+

rust-backend/src/main.rs

@@ -0,0 +1,22 @@
+use actix_web::{get, Responder, HttpResponse, HttpServer, App};
+
+#[get("/hc")]
+async fn healthcheck() -> impl Responder {
+    HttpResponse::Ok().body("OK")
+}
+
+#[actix_web::main]
+async fn main() -> std::io::Result<()> {
+    let port = std::env::var("RUST_BACKEND_PORT")
+        .ok()
+        .and_then(|port| port.parse::<u16>().ok())
+        .unwrap_or(8080);
+
+    HttpServer::new(|| {
+        App::new()
+            .service(healthcheck)
+    })
+    .bind(("127.0.0.1", port))?
+    .run()
+    .await
+}