Update apt repositories before call build-dep.

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

By default pipelines do not run in Merge Request context, but that's
exactly what the parent ci-package-builder pipeline is now doing.

Add a rule to run the local pipeline in whatever context the parent
pipeline triggered it.

Signed-off-by: Emanuele Aina <emanuele.aina@collabora.com>

Add some rules to the local pipeline so it gets skipped when tags are
pushed, instead of creating jobs that are currently failing.

Signed-off-by: Emanuele Aina <emanuele.aina@collabora.com>

Apertis has moved to using external references in the CI config path setting
for the packagign repositories, so the gitlab-ci.yml embedded in the
repository is no longer needed.

Signed-off-by: Emanuele Aina <emanuele.aina@collabora.com>

Signed-off-by: Emanuele Aina <emanuele.aina@collabora.com>

Signed-off-by: Andrew Lee (李健秋) <ajqlee@debian.org>