Using Ruby 3.1 as default on GitLab SaaS Linux runners

What this post added

This post announces the change of the default container image for GitLab SaaS Runners on Linux from Ruby 2.5 to Ruby 3.1, effective January 12, 2023. It provides instructions on how users can check their CI/CD jobs for compatibility by configuring them to run in a Ruby 3.1 container. It also mentions plans to define a new container image maintenance process for GitLab SaaS Runners on Linux to ensure the default image is updated with the latest security fixes.