Add source entries to sources.list for apt

Add entries to sources.list with script scripts/apt_source.chroot
The script add both 'deb' and 'deb-src' entires as they existed
in pre-debos images.

Fixes T4377

Signed-off-by: Denis Pynkin <denis.pynkin@collabora.com>
Reviewed-by: Sjoerd Simons <sjoerd.simons@collabora.co.uk>
Reviewed-by: Héctor Orón Martínez <hector.oron@collabora.co.uk>
Differential Revision: https://phabricator.apertis.org/D7376