feat: use Qt6_DIR for cmake build

Author: panzergame

ci/buildsonarcloud.sh

@@ -30,7 +30,7 @@ pushd "$BUILD_DIR"
 
 # configure build files with CMake
 # we need to explicitly set the install prefix, as CMake's default is /usr/local for some reason...
-cmake "$REPO_ROOT" -DCMAKE_BUILD_TYPE=Debug -DENABLE_COVERAGE=ON -DQt6_DIR=/opt/qt/
+cmake "$REPO_ROOT" -DCMAKE_BUILD_TYPE=Debug -DENABLE_COVERAGE=ON -DQt6_DIR=/opt/qt/6.8.2/gcc_64/lib/cmake/
 
 # Wraps the compilation with the Build Wrapper to generate configuration (used
 # later by the SonarQube Scanner) into the "bw-output" folder