Add watchtower.md

watchtower.md

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+version: "3.9"
+
+services:
+  watchtower:
+    image: containrrr/watchtower:latest
+    container_name: watchtower
+    restart: unless-stopped
+
+    volumes:
+      - /var/run/docker.sock:/var/run/docker.sock
+      - /etc/localtime:/etc/localtime:ro
+      - /etc/timezone:/etc/timezone:ro
+
+    environment:
+      - TZ=Europe/Amsterdam
+      - WATCHTOWER_CLEANUP=true
+      - WATCHTOWER_POLL_INTERVAL=900   # elke 15 minuten checken
+
+    command:
+      - "--cleanup"
+      - "--poll-interval=900"