.gitlab-ci.yml: move coverage analysis to the end, set it manual
See #3339 (closed). We want to have first fast tests. Once we will have #3340, we will run again always this stage.
[A venir] Mise en place de quotas sur nos instances GitLab. Plus d'information sur : https://doc-si.inria.fr/pages/viewpage.action?pageId=129728565
[Coming soon] Quotas installation on our GitLab instances. More information: https://doc-si.inria.fr/pages/viewpage.action?pageId=129728565
See #3339 (closed). We want to have first fast tests. Once we will have #3340, we will run again always this stage.