Add support for https://docs.gitlab.com/api/groups/#archive-a-group and https://docs.gitlab.com/api/groups/#unarchive-a-group. ## Implementation Guide - Follow the `CONTRIBUTING.md` guide for setting up your local development environment. - Clone the community fork of this project. - Add new endpoints to `groups.go` following the guide in `docs/guides/AddingAPISupport.md`. - Add unit and integration tests.