Add lightdm-qt5-devel for lightdm-kde-greeter
Otherwise the build via linux.yml fails with the error:
-- Checking for module 'liblightdm-qt5-3>=1.4.0'
-- Package 'liblightdm-qt5-3', required by 'virtual:world', not found
-- Checking for module 'liblightdm-qt5-2>=1.4.0'
-- Package 'liblightdm-qt5-2', required by 'virtual:world', not found
CMake Error at /usr/share/cmake/Modules/FindPackageHandleStandardArgs.cmake:230 (message):
QLIGHTDM_LIBRARIES (missing: QLIGHTDM_INCLUDE_DIR)
https://invent.kde.org/golubevan/lightdm-kde-greeter/-/jobs/1458585
Сhecked the build in this image locally with the additional installation of the package, it completed successfully.