These are maintenance releases, collecting a number of minor bug fixes. We are aware of reports of automated attacks against outdated versions of OJS, particularly 3.3.0-15 and older. We work hard to keep our software secure; please make sure to stay up to date!
Of all the changes, for me, the most significant is that we can now create images and maintain OJS and OMP in the same way. This will allow images to be released much faster or even automated with GitHub Actions right after each release.
WARNING: Those images are not yet tested on production. Please use with caution.