Before Ruby 3 was live, we had 2 hourly scheduled builds against master that used a Ruby 3 build image. The results of these builds were posted to the `#f_ruby3` Slack channel for visibility. During the rollout, we then swapped Ruby 2 and 3 pipelines, so these builds are now for Ruby 2, which we still need to support for several milestones. These builds are noisy, however, and now unrelated to Ruby 3. We should move them to a different Slack channel to keep the Ruby 3 Slack channel focused on Ruby 3 related updates and topics. This can be changed here: https://gitlab.com/gitlab-org/quality/triage-ops/-/blob/431978d6143ba4bed48f524134723e9223189d36/triage/triage/pipeline_failure/config/ruby2_branch.rb#L9