Wrong gitlab runner for windows_python

.gitlab/ci/build.gitlab-ci.yml

@@ -132,6 +132,16 @@ build:windows_python:
   tags:
     - windows
 
+  image: buildtools
+  before_script:
+    # Install Chocolatey
+    - Set-ExecutionPolicy Bypass -Scope Process -Force; [System.Net.ServicePointManager]::SecurityProtocol = [System.Net.ServicePointManager]::SecurityProtocol -bor 3072; iex ((New-Object System.Net.WebClient).DownloadString('https://community.chocolatey.org/install.ps1'))
+    # Install dependencies
+    - choco install cmake.install --installargs '"ADD_CMAKE_TO_PATH=System"' -Y
+    - choco install git -Y
+    - choco install python -Y
+    # Update PATH
+    - $env:Path = [System.Environment]::GetEnvironmentVariable("Path","Machine") + ";" + [System.Environment]::GetEnvironmentVariable("Path","User")
   script:
     - python3 -m pip install virtualenv
     - virtualenv venv