PR checks won't be triggered on PRs created by Actions workflows.
Therefore mark PRs created by workflows as draft to prompt maintainers
to take the PR out of draft, thereby triggering PR checks.
This commit ensures that the changelog is updated before a release with
the correct date and version.
Also, after a release, a mergeback PR is created to ensure that the
changelog update and version bump is available in main.
Andrew Eisenberg
Henry Mercer
Chris Gavin
Robert
Robert Brignull