CI: Use OBS_UPLOAD_BRANCHES rather than overriding rules
The ci-to-obs.v2.yml
pipeline allows to configure the git branches
that will trigger an upload to OBS by setting the regular expression in
the $OBS_UPLOAD_BRANCHES
variable, so overriding job rules is no
longer needed.
- Non-uploading pipeline: https://gitlab.collabora.com/em/lava/-/pipelines/60191
- Uploading pipeline (
collabora/staging
): https://gitlab.collabora.com/em/lava/-/pipelines/60192