.gitlab-ci.yml: use a template for merge request pipelines
This makes it clearer what the puprose of the workflow is (as it may be a niche feature not everybody knows)
Followup to !48 (merged)
Edited by Abderrahim Kitouni
This makes it clearer what the puprose of the workflow is (as it may be a niche feature not everybody knows)
Followup to !48 (merged)