Merge branch 'hp-fix-master-set-ubi-arch' into 'master'

Set default ARCH argument for UBI gitlab-rails

See merge request https://gitlab.com/gitlab-org/build/CNG/-/merge_requests/1613



Merged-by: Balasankar 'Balu' C <balasankar@gitlab.com>
Approved-by: Balasankar 'Balu' C <balasankar@gitlab.com>
Co-authored-by: Hossein Pursultani <hpursultani@gitlab.com>

gitlab-rails/Dockerfile.build.ubi8

@@ -15,6 +15,7 @@ ARG NODE_VERSION=18.17.1
 ARG RUBY_VERSION=3.0.6
 ARG YARN_VERSION=1.22.18
 ARG GITLAB_USER=git
+ARG ARCH=x64
 
 ADD gitlab-ruby.tar.gz /
 ADD gitlab-rust.tar.gz /