added wixtoolset.ui.wixext package to path

Author: chcg

.github/workflows/CI_build.yml

@@ -48,5 +48,6 @@ jobs:
            Rename-Item -Path ".\buildPaths.bat.orig" -NewName "buildPaths.bat"
            dotnet tool install --global wix
            $env:WIX_HEAT_PATH="${{ github.workspace }}\packages\wixtoolset.heat.5.0.2\tools\net472\x64"
-           $env:PATH = $env:WIX_HEAT_PATH + ';' + $env:PATH
+           $env:WIX_UI_PATH="${{ github.workspace }}\packages\wixtoolset.ui.wixext.5.0.2\wixext5"
+           $env:PATH = $env:WIX_HEAT_PATH + ';' + $env:WIX_UI_PATH + ';' + $env:PATH
            .\buildAll.bat ${{ matrix.build_platform }}