Clean up unused docker images


# Remove all exited container
docker rm $(docker ps -q -f status=exited)

# Remove none tag images (image with tag <none>)
docker images | grep "<none>" | awk '{print $3}' |xargs docker rmi -f

# Remove all images that is not using by any running container
# note: docker ps --format {{.Image} -> List all images of running container then set it as grep pattern
docker images --format {{.Repository}}:{{.Tag}} | grep -vFf <(docker ps --format {{.Image}}) | xargs docker rmi -f

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