use powershell

.github/workflows/test-windows.yml

@@ -238,16 +238,8 @@ jobs:
     - name: Test Wheel
       if: "github.event_name != 'pull_request' && !contains(matrix.python-version, 'pypy')"
       run: |
-        cd C:\pillow
-        python -m pip install pytest pytest-timeout
-        for %%f in (dist\*.whl) do python -m pip install %%f
-        reg add "HKLM\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Image File Execution Options\python.exe" /v "GlobalFlag" /t REG_SZ /d "0x02000000" /f
-        path C:\pillow\winbuild\build\bin\;%PATH%
-        set CI=
-        python -m pytest -vx Tests\check_wheel.py Tests
-      shell: cmd /c copy {0} docker.bat && docker run --rm -v %GITHUB_WORKSPACE%:C:\pillow %DOCKER_IMAGE% C:\pillow\docker.bat
-      env:
-        DOCKER_IMAGE: winamd64/python:${{ matrix.python-version }}-windowsservercore
+        docker run --rm -v ${env:GITHUB_WORKSPACE}:C:\pillow mcr.microsoft.com/windows/servercore:ltsc2022 powershell C:\pillow\winbuild\test_docker.ps1 ${{ matrix.python-version }}.0 ${{ matrix.architecture }}
+      shell: pwsh
 
     - name: Upload wheel
       uses: actions/upload-artifact@v3

winbuild/test_docker.ps1

@@ -0,0 +1,26 @@
+param ([string]$python,[string]$arch)
+$ErrorActionPreference  = 'Stop'
+$ProgressPreference = 'SilentlyContinue'
+$suffix = if ($arch -eq "x64") {"-amd64"} else {""}
+$url = 'https://www.python.org/ftp/python/{0}/python-{0}{1}.exe' -f ($python, $suffix)
+[Net.ServicePointManager]::SecurityProtocol = [Net.SecurityProtocolType]::Tls12
+Invoke-WebRequest -Uri $url -OutFile 'setup.exe'
+Start-Process setup.exe -Wait -NoNewWindow -PassThru -ArgumentList @(
+        '/quiet',
+        'InstallAllUsers=0',
+        'TargetDir=C:\Python',
+        'PrependPath=1',
+        'Shortcuts=0',
+        'Include_doc=0',
+        'Include_pip=1',
+        'Include_test=0'
+    )
+$env:CI = "true"
+$env:path += ";C:\Python\;C:\pillow\winbuild\build\bin\"
+cd C:\pillow
+& python -VV
+& python -m ensurepip
+& python -m pip install pytest pytest-timeout
+& python -m pip install "dist\$(Get-ChildItem dist\*.whl -Name)"
+& python -m pytest -vx Tests\check_wheel.py Tests
+if ((Test-Path -LiteralPath variable:\LASTEXITCODE)) { exit $LASTEXITCODE }