Howtoforge published a tutorial about installing GitLab on Debian 11.
How to Install GitLab on Debian 11
GitLab is a free and open-source DevOps platform that allows teams to iterate faster and innovate together. It is a web-based tool developed by GitLab Inc. It is very similar to GitHub and provides a Git repository manager providing wiki, issue-tracking, and continuous integration and deployment. GitLab community edition is available absolutely free for development and production environment.