Contributing to GitLab after move to a single codebase

This post details the technical implications of merging GitLab CE and EE into a single codebase for contributors. It clarifies that this change does not impact contributions to other GitLab projects (Charts, Design System, UI, Omnibus, Runner). It also states that licensing remains the same (CE under MIT, EE proprietary) and highlights the benefits of a single codebase for efficiency, reduced duplicate work, and simplified contribution workflows (single place for issues and MRs, elimination of `ee_compat_check` errors). It provides instructions for re-submitting MRs against the new GitLab project.