add the option to set apps in the machine file.

.devcontainer/devcontainer.json

CMake/VirtualFluidsMacros.cmake

CMake/cmake_config_files/GITLAB-RUNNER02.config.cmake

CMake/cmake_config_files/MOLLOK.config.cmake

CMake/cmake_config_files/TESLA03.config.cmake

CMakeLists.txt

apps/gpu/LBM/WTG_RUB/WTG_RUB.cpp

gpu.cmake