All Along the WATCHTOWER!
Simple docker-compose to update your Synology docker containers on regular basis.

Run from docker-compose:
version: "3.8"
services:
watchtower:
image: containrrr/watchtower:latest
container_name: watchtower
environment:
- TZ=Europe/Warsaw
- WATCHTOWER_CLEANUP=true
- WATCHTOWER_INCLUDE_STOPPED=true
- WATCHTOWER_REVIVE_STOPPED=false
- WATCHTOWER_SCHEDULE=0 0 2 * * *
- WATCHTOWER_ROLLING_RESTART=true
volumes:
- /var/run/docker.sock:/var/run/docker.sock
restart: unless-stopped
Refer to docs for additional variables/changes to above: Arguments - Watchtower (containrrr.dev)