Add support for test packages on MR

Testing is a key value in Apertis, this commit adds support for testing packages build in the context of a Merge Request. This is used by ci-package-builder which sets PROJET_PATH and MR_IID variables to fetch the Gitlab artifacts from the OBS stage.

During the ospack stage, after installing the packages, the package updates are installed and LAVA jobs are submitted to allow developers to test their changes. It is even possible to filter some tests to avoid wasting resources.

https://phabricator.apertis.org/T9447

Signed-off-by: Walter Lozano walter.lozano@collabora.com