gitlab-ci: Check merge request for allowing edits

Ensures that users tick allow collabration to make rebasing possible
from maintainers, and fast forward merge requests.

Signed-off-by: Marius Vlad <marius.vlad@collabora.com>

.gitlab-ci.yml

@@ -92,6 +92,7 @@ check-commit:
     - when: never
   script:
     - ci-fairy check-commits --signed-off-by --junit-xml=results.xml
+    - ci-fairy check-merge-request --require-allow-collaboration --junit-xml=result.xml
   variables:
     GIT_DEPTH: 100
   artifacts: