Check dockerfiles for updates and rebuild service with docker compose. Download https://gitlab.com/MatthiasLohr/omnibus-gitlab-management-scripts/-/blob/main/docker-image-update-check.sh as docker-image-update-check.sh in the same directory.

docker-image-updater.sh

#!/bin/bash -e

# Set path of docker project folder to search for dockerfiles
DOCKER_PROJECT_PATH=./docker

# Check for required file/command
if [[ ! -f docker-compose.yml ]]; then
    echo "Required file (docker-compose.yml) not existent for docker updater" >&2
    exit 1
fi
if [[ ! -x "$(command -v docker)" || ! -x "$(command -v docker compose)" ]]; then
    echo "Required command docker (compose) not existent for docker updater" >&2
    exit 1
fi

# Start update check and pull process
echo "Pull new images..."
DOCKER_IMAGE_UPDATE_CHECK_OUTPUT=$(
    find ${DOCKER_PROJECT_PATH} -name "Dockerfile" -exec cat {} + | \
    awk '/FROM/ {print $2}' | sort | uniq -i | \
    xargs -r -I {} ./docker-image-update-check.sh {} "docker pull {} --quiet"
)
echo ${DOCKER_IMAGE_UPDATE_CHECK_OUTPUT}
if [[ ${DOCKER_IMAGE_UPDATE_CHECK_OUTPUT} != *"Update available"* ]]; then
    echo "No updates available... Bye! 👋"
    exit 0
fi

echo "Build images..."
docker compose build --pull --quiet

echo "Finished!"
exit 0