Default values for the variables:
UPDATE_PERIOD=60
IMAGE_FILTER="127.0.0.1:5000" # regexp
DOCKER_HOSTS=unix:///var/run/docker.sock
TELEGRAM_BOT_TOKEN
TELEGRAM_CHAT_ID
https://hub.docker.com/r/dtorry/registry_listener
An overview of various services that enable pull-based deployments, similar to the registry_listener:
A self-hosted service that watches for changes in a Git repository and automatically updates Docker containers.
https://github.com/djmaze/shepherd
A tool that automatically updates Docker containers when a new image is available.
A container that monitors running Docker containers and automatically updates them when a new image is available.
https://www.ctl.io/developers/blog/post/watchtower-automatic-updates-for-docker-containers/