checkout is bumped from v3 to v4, there shouldn't be any breaking
changes (just bumps the node version)
upload-artifact is bumped from v2 to v4, our use case shouldn't break
github-script is bumped from v3 to v7. I don't see any breaking changes
that should affect us. Again mainly a nodejs version bump
* Adopt keep a changelog
Ref: https://keepachangelog.com/en/1.0.0/
* Add changelog to release and contributing docs
* Use H2 for automatically added Download section
The individual changelog subsections use H3 and the changelog section
uses H2, so the Download section should use the same heading
* Add already present changes to changelog
* Mention changelog issue references in CONTRIBUTING.md
Whenever a release is published, this action will create a release
archive and update the release body with a download section.
This also integrates the suggestions from #2276Resolves#2276
