Backport v2023 <- v2025dev3: Restrict oslist-upload jobs to the default branch only

Otherwise pipelines triggered on other branches will overwrite apertis-oslist-daily.json leading to list images for old apertis releases instead of the current dev release.

Signed-off-by: Dylan Aïssi dylan.aissi@collabora.com

requested review from @wlozano

assigned to @daissi

mentioned in issue apertis-issues#525 (closed)

merged