server: Limit the scope of a mutable variable

server/src/main.rs

@@ -44,8 +44,11 @@ struct SharedData<'a> {
 
 #[actix_web::main]
 async fn main() -> std::io::Result<()> {
+    let config = {
         let mut config = Config::parse();
         config.template_directory = config.template_directory.canonicalize()?;
+        config
+    };
 
     env_logger::Builder::new()
         .filter_level(if config.dev_mode {