github_actions: test both scenarios for Python folder source

Signed-off-by: Adrian Vladu <avladu@cloudbasesolutions.com>

Author: ader1990

.github/workflows/build_test_cbsinit.yml

@@ -9,6 +9,7 @@ jobs:
       max-parallel: 100
       matrix:
         os: ['windows-2022']
+        download_official_python_msi: ["true", "false"]
         cbsinit_repo: ['https://github.com/cloudbase/cloudbase-init']
         cbsinit_branch: ['master']
         python_version: ['3.14_4']
@@ -30,7 +31,7 @@ jobs:
             -VSRedistDir "''" ^
             -CloudbaseInitRepoUrl ${{ matrix.cbsinit_repo }} ^
             -CloudbaseInitRepoBranch ${{ matrix.cbsinit_branch }} ^
-            -InstallOfficialPythonMsi:$false ^
+            -InstallOfficialPythonMsi:$${{ matrix.download_official_python_msi }} ^
             -OfficialPythonMsiChecksum "C10234D0D9BD89F6F6DD55BAE28EDE0F97EE0DF4"
     - uses: actions/upload-artifact@v7
       with: