ci: disable duplicated pipelines on merge requests
When Marge rebases, it creates two pipelines, one in the author's account due to the rebase and another one in the target account due to the merge request event. Depending on the order they appear, Marge erroneously check the author's pipeline, and since it doesn't have the rights to start this pipeline, Marge fails to merge because it timed out (since the pipeline never got run).
Fix this by disabling the author's pipeline (source of type "push") when a merge request is open.
Signed-off-by: Helen Koike helen.koike@collabora.com