fix GH installer script input path

Author: chcg

.github/workflows/CI_build.yml

@@ -43,8 +43,8 @@ jobs:
       if: matrix.build_configuration == 'Release'
       working-directory: installer
       run: |
-           $env:PYTHONBUILDDIR_X64='..\packages\python.3.12.8\tools'
-           $env:PYTHONBUILDDIR='..\packages\pythonx86.3.12.8\tools'
+           $env:PYTHONBUILDDIR_X64='${{ github.workspace }}\packages\python.3.12.8\tools'
+           $env:PYTHONBUILDDIR='${{ github.workspace }}\packages\pythonx86.3.12.8\tools'
            Rename-Item -Path ".\buildPaths.bat.orig" -NewName "buildPaths.bat"
            $env:WIX_PATH="C:\Program Files (x86)\WiX Toolset v3.11\bin"
            $env:PATH = $env:PATH + ';' + $env:WIX_PATH