Integrate gitlab-ci/yt-381-add-gitbot-token-for-custom-projects

Commit: seco-ne/yocto/infrastructure/gitlab-ci@a9125378

YT-381: Use gitbot token for custom projects

Build process uses GITLAB_PRIVATE_TOKEN for multiple upstream repositories, including private SECO repos. However, the new token rotation mechanism does not support variables with multiple tokens, making this approach inconvenient.

This changes:

• Use GITBOT_TOKEN for SECO repositories.
• Keep GITLAB_PRIVATE_TOKEN for other upstream repos.

Source merge request: seco-ne/yocto/infrastructure/gitlab-ci!439 (merged)

mentioned in merge request seco-ne/yocto/infrastructure/gitlab-ci!439 (merged)

merged