rpi-setup/watchtower

Running Watchtower for updateing docker containers https://hub.docker.com/r/containrrr/watchtower

docker run -d --name watchtower -v /var/run/docker.sock:/var/run/docker.sock containrrr/watchtower

See https://containrrr.dev/watchtower/arguments/ for usage instructions

if you want to remove old images new cotainer started then use 
docker run -d --name watchtower -v /var/run/docker.sock:/var/run/docker.sock containrrr/watchtower /
Argument: --cleanup Environment Variable: WATCHTOWER_CLEANUP Type: Boolean Default: false