gitlab-ci: ensure coverity job runs weekly
Summary
Makes it so that the coverity job runs when the "weekly" schedule is triggered
Purpose
Currently, the condition is not strict enough, and so the job runs every time a scheduled task is triggered - which is currently daily.
Checklist
Please read https://gitlab.freedesktop.org/NetworkManager/NetworkManager/-/blob/main/CONTRIBUTING.md before opening the merge request. In particular, check that:
-
the subject for all commits is concise and explicative -
the message for all commits explains the reason for the change -
the source is properly formatted -
any relevant documentation is up to date -
you have added unit tests if applicable -
the NEWS file is updated when the change deserves to be mentioned, for example for new features, behavior changes, API deprecations, etc.