added dockerfile for watchtower

watchtower/docker-compose.yml

@@ -0,0 +1,12 @@
+version: "3"
+
+services:
+  watchtower:
+    image: containrrr/watchtower
+    volumes:
+      - /var/run/docker.sock:/var/run/docker.sock
+    environment:
+      WATCHTOWER_NOTIFICATION_REPORT: "true"
+      WATCHTOWER_NOTIFICATION_URL: NOTIFICATOION URL ACCORDING TO https://containrrr.dev/shoutrrr/v0.8/services
+      WATCHTOWER_NOTIFICATIONS_DELAY: 300 #required to start Notification service before sending notification
+    restart: unless-stopped