packaging: Automatically submit OBS requests

At the moment no submit request is ever generated by this job template for the packages updated in the :snapshots OBS project, and they need to be created manually. This differs from the package job template, which automatically creates a submit request in specific cases.

Invoke submit-osc-request.py as the apertis-build-package.yaml template does to launch osc submitrequest when the checked out HEAD is pointed by a tag, which is a good indication that the built commit is meant to produce packages that should be released in the main repositories.

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