From krita.org:
We are releasing the first Beta of Krita 5.2.3. This release primarily brings a complete overhaul of our build system, making it so that our CI system can now build for all 4 platforms (a Continuous Integration system basically builds a program after every change, runs some tests and based on that helps us track down mistakes we made when changing Krita’s code).
Read more on krita.org>
Testing packages for all platforms are provided immediately following the l-o-o-o-n-g list of improvements and updates and fixes in this version.
Thank you to the Krita developers and to all the volunteers who made this release possible.