refactor: switch to nammed docker volumes

docker-compose.yml

@@ -4,11 +4,15 @@ services:
     container_name: uptime-kuma
     restart: always
     volumes:
-      - ./data:/app/data
+      - uptime_kuma_data:/app/data
       - /var/run/docker.sock:/var/run/docker.sock:ro
     networks:
       - reverse-proxy
 
+volumes:
+  uptime_kuma_data:
+    external: true
+
 networks:
   reverse-proxy:
     external: true