Signed-off-by: Ariel D'Alessandro <ariel.dalessandro@collabora.com>

import-debian-package script now runs all the steps automatatically. The
recently added --push-remote option allows creating and pushing the
imported package to apertis remote gitlab instance.

Document the previously manual steps (performed now by the script).

Signed-off-by: Ariel D'Alessandro <ariel.dalessandro@collabora.com>

This tool is moved from `infrastructure/packaging-tools`.

Signed-off-by: Frédéric Danis <frederic.danis@collabora.com>

Signed-off-by: Louis-Francis Ratté-Boulianne <lfrb@collabora.com>

Differential Revision: https://phabricator.apertis.org/D4796

Signed-off-by: Louis-Francis Ratté-Boulianne <lfrb@collabora.com>

Differential Revision: https://phabricator.apertis.org/D4761