Container Images for CI

suse-qt515: OpenSuSE with Qt 5.15
suse-qt68: OpenSuSE with Qt 6.8
fedora: Fedora Rawhide

The following images don't have the documentation inside, meaning they are not suitable to build Qt documentation such as Fluid API documentation:

Build

Make the image with:

sudo make build

Push to the Docker hub:

sudo make push