Review code changes, open coding issues, publish release notes. Every one is ready to run, and you can adjust it in plain language.
Give release owners a sourced changelog draft for the ready branch.
Get a GitLab changelog draft in an issue, with changes grouped by type and linked to the work behind them.
Document changes as each tagged version goes out.
Your GitHub releases get readable notes as new tags arrive, with changes grouped by type and linked to commits.