Otherwise we get the following error:
ERROR: The process with PID 5192 (child process of PID 1372) could not be terminated.
Reason: This process can only be terminated forcefully (with /F option).
* CI system: Add Windows version to output
* CI system: Also build for Qt LTS version (currently 6.2)
* CI system: Also build for current Qt version (currently 6.3)
Resolves#180
* initial github build action
* Github actions: Install Qt 5.15
... We use a specific Github Action for this, since the current Qt
version shipping with Ubuntu is too old.
* Github Action: Cache Qt installation
* Github Action: Build on Linux and Windows
Co-authored-by: Richard Spindler <oracle@propirate.net>