extended clean-up task to remove dangling Docker images
extended clean-up task to remove dangling Docker images

openHPI/codeocean,flxw/codeocean,flxw/codeocean,torpedro/codeocean,openHPI/codeocean,torpedro/codeocean,openHPI/codeocean,torpedro/codeocean,flxw/codeocean,torpedro/codeocean,openHPI/codeocean,torpedro/codeocean,flxw/codeocean,flxw/codeocean,openHPI/codeocean,openHPI/codeocean