docker-image-housekeeping.sh

#!/usr/bin/env bash

# delete dead containers
docker container prune -f

# keep last 2 builds for each image from the repository
for diru in $(docker images \
    --format "{{.Repository}}" | sort | uniq)
do
    for dimr in $(docker images \
                    --format "{{.ID}};{{.Repository}}:{{.Tag}};'{{.CreatedAt}}'" \
                    --filter reference="$diru" | sed -r "s/\s+/~/g" | tail -n+3)
    do
        img_tag=$(echo $dimr | cut -d";" -f2);
        docker rmi $img_tag;
    done;
done

# clean dangling images if any
docker image prune -f