add version info to health endpoint

src/handlers.rs

@@ -99,6 +99,7 @@ pub async fn put_cache_item(
 
 #[derive(Serialize)]
 pub struct HealthStatus {
+    pub version: &'static str,
     pub cache_entries: usize,
     pub cache_size: u64,
     pub cache_capacity: u64,
@@ -123,6 +124,7 @@ pub async fn get_heath_status(app_data: Data<AppState>, auth: BearerAuth) -> imp
         let now = SystemTime::now();
         if let Ok(shared) = app_data.shared.read() {
             HttpResponse::Ok().json(HealthStatus {
+                version: env!("CARGO_PKG_VERSION"),
                 cache_entries: shared.lru_cache.len(),
                 cache_size: shared.stats.cache_size,
                 cache_capacity: app_data.config.max_cache_size.unwrap_or(u64::MAX),