GitLab

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;

Set ofs.tpc to /opt/eos/xrootd/bin/xrdcp; Merge multiple 'RUN' commands to slim more 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"