This guide is intended for maintainers.
All development targets the main branch. New releases for the 2.x series are cut from this.
For the 1.x series which will be supported until at least September 1 2023 we also have a release-1.x branch where we try to backport all bug fixes.
Backports are done by tibdex/backport. Apply the label backport release-1.x to the PRs and once they are merged a new PR is opened.