Test free-threaded Python 3.13t and 3.14t (#261)

Author: hugovk

.github/workflows/test.yml

@@ -6,18 +6,28 @@ permissions: {}
 
 env:
   FORCE_COLOR: 1
+  PIP_DISABLE_PIP_VERSION_CHECK: 1
 
 jobs:
   test:
     runs-on: ${{ matrix.os }}
     strategy:
       fail-fast: false
       matrix:
-        python-version: ["pypy3.11", "3.9", "3.10", "3.11", "3.12", "3.13", "3.14"]
+        python-version:
+          - "pypy3.11"
+          - "3.14t"
+          - "3.14"
+          - "3.13t"
+          - "3.13"
+          - "3.12"
+          - "3.11"
+          - "3.10"
+          - "3.9"
         os: [windows-latest, macos-latest, ubuntu-latest]
 
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v5
         with:
           persist-credentials: false
 
@@ -27,6 +37,11 @@ jobs:
           python-version: ${{ matrix.python-version }}
           allow-prereleases: true
 
+      - name: Set PYTHON_GIL
+        if: endsWith(matrix.python-version, 't')
+        run: |
+          echo "PYTHON_GIL=0" >> "$GITHUB_ENV"
+
       - name: Install Linux dependencies
         if: startsWith(matrix.os, 'ubuntu')
         run: |
@@ -46,7 +61,7 @@ jobs:
 
       - name: Tox tests
         run: |
-          uvx --with tox-uv tox -e py
+          uvx --python ${{ matrix.python-version }} --with tox-uv tox -e py
 
       - name: Upload coverage
         uses: codecov/codecov-action@v5