Stop directly building docker images

There is no a seperate repository and job for building apertis related
docker images for use in Jenkins. So start using that and stop building
the image as part of the image build job(s)

Signed-off-by: Sjoerd Simons <sjoerd.simons@collabora.co.uk>
Reviewed-by: Denis Pynkin <denis.pynkin@collabora.com>
Differential Revision: https://phabricator.apertis.org/D7359