ci: Explicitly enable CPackWiXGenerator test only in specific jobs

Drop the environment-based heuristic.

.gitlab/ci/configure_windows_arm64_vs2022_ninja.cmake

@@ -3,6 +3,7 @@ set(CMake_TEST_GUI "OFF" CACHE BOOL "")
 set(BUILD_QtDialog "OFF" CACHE BOOL "")
 set(CMAKE_PREFIX_PATH "" CACHE STRING "")
 
+set(CMake_TEST_CPACK_WIX "ON" CACHE BOOL "")
 set(CMake_TEST_TLS_VERIFY_URL "https://gitlab.kitware.com" CACHE STRING "")
 set(CMake_TEST_TLS_VERSION "1.2" CACHE STRING "")
 

.gitlab/ci/configure_windows_vs2022_x64_ninja.cmake

@@ -3,6 +3,8 @@ if (NOT "$ENV{CMAKE_CI_NIGHTLY}" STREQUAL "")
   set(CMake_TEST_ISPC "ON" CACHE STRING "")
   set(CMake_TEST_Swift "ON" CACHE STRING "")
 endif()
+
+set(CMake_TEST_CPACK_WIX "ON" CACHE BOOL "")
 set(CMake_TEST_TLS_VERIFY_URL "https://gitlab.kitware.com" CACHE STRING "")
 set(CMake_TEST_TLS_VERSION "1.2" CACHE STRING "")
 

Tests/CMakeLists.txt

@@ -978,16 +978,8 @@ if(BUILD_TESTING)
     endif()
   endif()
 
-  # On Windows run the CPackWiXGenerator test
-  # if the WiX Toolset seems to be available
   if(WIN32)
-    file(TO_CMAKE_PATH "$ENV{WIX}" WIX_ROOT)
-
-    find_program(WIX_LIGHT_EXECUTABLE light
-      PATHS "${WIX_ROOT}/bin"
-      DOC "WiX Toolset light.exe location")
-
-    if(WIX_LIGHT_EXECUTABLE)
+    if(CMake_TEST_CPACK_WIX)
       add_test(CPackWiXGenerator ${CMAKE_CTEST_COMMAND}
         -C \${CTEST_CONFIGURATION_TYPE}
         --build-and-test