GitLab: Omit pages job on merge_request_event pipelines
As I found out when Thomas went to submit a job, merge pipelines from a fork accidentally select this job -- which will then fail as none of the prior jobs are included in such pipelines.
(Thanks to Dan for diagnosing the misconfiguration.)
Suggested-by: Daniel P. Berrangé berrange@redhat.com Signed-off-by: John Snow jsnow@redhat.com