KDE neon has long had Docker images so you can run the latest KDE software without the faff of an operating system install. We’ve just moved the host for these into the KDE Invent server.
https://invent.kde.org/neon/docker-images/container_registry
You can get the neondocker script to run them
https://invent.kde.org/neon/docker-images/-/raw/master/neondocker/neondocker.rb?inline=false
or manually you can get it with
docker pull invent-registry.kde.org/neon/docker-images/plasma:unstable
xhost +
docker run -ti -v /tmp/.X11-unix:/tmp/.X11-unix -v ~/src:/home/neon/src -e DISPLAY=:0 invent-registry.kde.org/neon/docker-images/plasma:unstable konsole