feat(nix): Switch to Nix for builds

src/thread/manager.rs

@@ -135,8 +135,8 @@ impl ThreadManager {
             })
             .collect();
 
-        #[allow(clippy::clone_double_ref)]
-        let monitor_for_monitor_thread = self.monitor.clone();
+        #[allow(suspicious_double_ref_op)]
+        let monitor_for_monitor_thread = self.monitor;
         let monitor_join_handle = std::thread::spawn(move || {
             let watch_result = monitor_for_monitor_thread.watch(Some(&watched_thread_ids));