CI doesn't fail when QML GUI is not loadable

[JoergAtGithub]

Bug Description

Currently the QML user interface is not loadable on Windows (and most likely on macOS too), but our CI builds doesn't detect this.

Version

Main

OS

Windows 11

[daschuer]

QML work is continued in 2.6

[acolombier]

Note to anyone willing to fix QML on Windows (and Mac?) - In order to make it run in #14360, I had to use windeployqt6.exe to add missing Qt components to the working directory (where mixxx.exe will be ran) as following

&"${env:MIXXX_VCPKG_ROOT}\installed\x64-windows-release\tools\Qt6\bin\windeployqt6.exe" ./mixxx.exe --dir . --libdir bin --plugindir plugins --qml-deploy-dir qml --qmldir ../res/qml/

[JoergAtGithub]

I just tried mixxx.exe --qml with latest main and the QML GUI came up. Everything is in our CMakeLists.txt, no call of additional tools like windeployqt6.exe is needed.

[acolombier]

Weird, it doesn't work out of the box for me on my Win 11 VM. Are you using Ninja as generator on CMake?

[JoergAtGithub]

Yes I use Ninja, everything is default, no settings modified. Runs from both, build and install directory.