[gnome-build-meta] Non-fast-forward update to branch tristan/gnome-boot

[Tristan Van Berkom <tvb src gnome org>]

The branch 'tristan/gnome-boot' was changed in a way that was not a fast-forward update.
NOTE: This may cause problems for people pulling from the branch. For more information,
please see:

 https://wiki.gnome.org/Git/Help/NonFastForward

Commits removed from the branch:

  5bc84d6... .gitlab-ci.yml: Added job to build the bootable image for x

Commits added to the branch:

  9ef764a... .gitlab-ci.yml: Added job to build the bootable image for x