ci: Enable CPack NuGet generator tests in a nightly job on Windows

Drop the environment-based heuristic.

.gitlab/ci/configure_windows_vs2022_x64_ninja.cmake

@@ -3,6 +3,7 @@ set(CMake_TEST_CXX_STANDARDS "98;11;14;17;20;23" CACHE STRING "")
 
 if (NOT "$ENV{CMAKE_CI_NIGHTLY}" STREQUAL "")
   set(CMake_TEST_CPACK_INNOSETUP "ON" CACHE STRING "")
+  set(CMake_TEST_CPACK_NUGET "ON" CACHE STRING "")
   set(CMake_TEST_ISPC "ON" CACHE STRING "")
   set(CMake_TEST_Swift "ON" CACHE STRING "")
 endif()

.gitlab/ci/env_windows_vs2022_x64_ninja.ps1

@@ -1,6 +1,7 @@
 if ("$env:CMAKE_CI_NIGHTLY" -eq "true") {
   . ".gitlab/ci/innosetup-env.ps1"
   . ".gitlab/ci/ispc-env.ps1"
+  . ".gitlab/ci/nuget-env.ps1"
   . ".gitlab/ci/swift-env.ps1"
 }
 

Tests/CMakeLists.txt

@@ -167,10 +167,7 @@ if(BUILD_TESTING)
     set(CPACK_BINARY_DEB OFF)
   endif()
 
-  # Look for NuGet to use for tests.
-  find_program(NUGET_EXECUTABLE NAMES NuGet nuget)
-
-  if(NUGET_EXECUTABLE)
+  if(CMake_TEST_CPACK_NUGET)
     set(CPACK_BINARY_NUGET ON)
   else()
     set(CPACK_BINARY_NUGET OFF)
@@ -1115,9 +1112,7 @@ if(BUILD_TESTING)
     if(CPACK_BINARY_DEB)
       list(APPEND ACTIVE_CPACK_GENERATORS DEB)
     endif()
-    # Check whether if NuGet command is found
-    # before adding NuGet tests
-    if(CPACK_BINARY_NUGET)
+    if(CMake_TEST_CPACK_NUGET)
       list(APPEND ACTIVE_CPACK_GENERATORS NUGET)
       set(CPACK_GENERATOR_STRING_NUGET NuGet)
     endif()