Test 3.13t (free-threaded) from Quansight-Labs/setup-python on Windows

Author: hugovk

.github/workflows/test-windows.yml

@@ -28,14 +28,18 @@ concurrency:
 
 env:
   COVERAGE_CORE: sysmon
+  FORCE_COLOR: 1
 
 jobs:
   build:
     runs-on: windows-latest
     strategy:
       fail-fast: false
       matrix:
-        python-version: ["pypy3.10", "3.9", "3.10", "3.11", "3.12", "3.13"]
+        python-version: ["pypy3.10", "3.9", "3.10", "3.11", "3.12", "3.13", "3.13t"]
+        include:
+        # Free-threaded
+        - { python-version: "3.13t", disable-gil: true }
 
     timeout-minutes: 30
 
@@ -63,13 +67,18 @@ jobs:
 
     # sets env: pythonLocation
     - name: Set up Python
-      uses: actions/setup-python@v5
+      uses: Quansight-Labs/setup-python@v5
       with:
         python-version: ${{ matrix.python-version }}
         allow-prereleases: true
         cache: pip
         cache-dependency-path: ".github/workflows/test-windows.yml"
 
+    - name: Set PYTHON_GIL
+      if: "${{ matrix.disable-gil }}"
+      run: |
+        echo "PYTHON_GIL=0" >> $GITHUB_ENV
+
     - name: Print build system information
       run: python3 .github/workflows/system-info.py
 
@@ -78,7 +87,7 @@ jobs:
         python3 -m pip install --upgrade pip
 
     - name: Install CPython dependencies
-      if: "!contains(matrix.python-version, 'pypy')"
+      if: "!contains(matrix.python-version, 'pypy') && !matrix.disable-gil"
       run: |
         python3 -m pip install PyQt6