Add node@18 to the build matrix for the GitLab image
What does this MR do and why?
Adds node@18 (current LTS) to the build image matrix. We are looking to update with:
Checklist
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(If applicable) Add patches if required for upgrading Ruby version in https://gitlab.com/gitlab-org/gitlab-build-images/-/tree/master/patches/ruby.
Edited by Lukas Eipert