Adding Quarterly retro template
What
Adding a quarterly retro template
Why
Didn't have one - new section proposed in https://gitlab.com/gitlab-com/gl-infra/delivery/-/issues/20208#note_1900278769
Adding a quarterly retro template
Didn't have one - new section proposed in https://gitlab.com/gitlab-com/gl-infra/delivery/-/issues/20208#note_1900278769