Don't run pipeline on pristine-* branches

The original rule blocked the pipeline from running on
branches named "pristine-/*"; which doesn't match
e.g. pristine-lfs or pristine-tar.

Signed-off-by: Christopher Obbard <chris.obbard@collabora.com>
2 jobs for wip/obbardc/pristine-lfs-dont-run-pipeline in 9 minutes and 51 seconds (queued for 6 minutes and 38 seconds)
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