Add gitlab-rust base image

See merge request https://gitlab.com/gitlab-org/build/CNG/-/merge_requests/1317



Merged-by: Jason Plum <jplum@gitlab.com>
Approved-by: Jason Plum <jplum@gitlab.com>
Reviewed-by: Jason Plum <jplum@gitlab.com>
Co-authored-by: Stan Hu <stanhu@gmail.com>