we do have a pretty full featured docker image already, would it help to re-use that [...]?
the problem would be where to host the image, as the images on ghcr.io cannot be accessed without a github token.

Originally posted by @milianw in #445 (comment)

Providing it directly in the docker hub would be an option: https://programatically.com/how-to-upload-docker-image-to-docker-hub/ - maybe it could be a general "KDAB development docker image" containing everything QT + KDE that is necessary for any projects you work on?
If the projects itself, like KDDockWidgets, are installed into separate directories, then even those can be build in a "clean" environment as long as the install directory of the installed version is not given to cmake.

Maybe other places or "base dev image" along with "images built on this" are better - I'm no docker person, so I can't tell...