Set buildkit image in all pipelines

Closes #2092

See merge request https://gitlab.com/gitlab-org/build/CNG/-/merge_requests/2073



Merged-by: Jason Plum <jplum@gitlab.com>
Approved-by: Dmytro Makovey <dmakovey@gitlab.com>
Approved-by: Jason Plum <jplum@gitlab.com>
Co-authored-by: Clemens Beck <cbeck@gitlab.com>