Debian 13 is planned to be released on August 9th. Once that is out, GitLab should start providing packages following the policy https://handbook.gitlab.com/handbook/engineering/infrastructure-platforms/gitlab-delivery/distribution/workflow/#os ### Definition of Done * [x] Ensure Packagecloud supports the Distribution * [x] Create a builder image for Debian 13 in https://gitlab.com/gitlab-org/gitlab-omnibus-builder. Previous example - https://gitlab.com/gitlab-org/gitlab-omnibus-builder/-/merge_requests/288 * [x] Add CI jobs to run unit tests and build packages. Previous example - https://gitlab.com/gitlab-org/omnibus-gitlab/-/merge_requests/6968 * [x] Add Debian 13 to the supported OS list - https://docs.gitlab.com/install/package/#supported-platforms * [x] Add to the list in https://docs.gitlab.com/install/package/debian/ also.