gitlab: make the schedule rules a bit more general

By default no jobs should run under the schedule and then we can be
more explicit for the ones that we need to. Otherwise I trigger all my
custom runners every time I do a scheduled run.

Reviewed-by: Daniel P. Berrangé <berrange@redhat.com>
Message-ID: <20251117115523.3993105-18-alex.bennee@linaro.org>
Signed-off-by: Alex Bennée <alex.bennee@linaro.org>
1 file changed