GitLab

Drop eos-debuginfo package installatation; Disable [eos] and [eos-tag] el-7 repos as they could clash with [eos-artifacts] and cause the fetch of non-relevant packages

Set recycle bin in eos_create_userhome; Install both python2 and python3 in every image, just for CI tests

All Dockerfile now: Merge multiple 'RUN' commands to slim images size; Replace 'ADD' with 'COPY' as per best practices;

Slim images size; Drop ubuntu disco Dockerfile; Drop 'ENV DEBIAN_FRONTEND noninteractive' in ubuntu bionic Dockerfile"