optimize(web): program cleanup on exit

infer-web.py

@@ -1638,7 +1638,15 @@ with gr.Blocks(title="RVC WebUI") as app:
             except:
                 gr.Markdown(traceback.format_exc())
 
-    try:
+try:
+    import signal
+    def cleanup(signum, frame):
+        signame = signal.Signals(signum).name
+        print(f'Got signal {signame} ({signum})')
+        app.close()
+        sys.exit(0)
+    signal.signal(signal.SIGINT, cleanup)
+    signal.signal(signal.SIGTERM, cleanup)
     if config.iscolab:
         app.queue(max_size=1022).launch(share=True, max_threads=511)
     else:
@@ -1649,5 +1657,5 @@ with gr.Blocks(title="RVC WebUI") as app:
             server_port=config.listen_port,
             quiet=True,
         )
-    except Exception as e:
+except Exception as e:
     logger.error(str(e))