add 313t test

.github/workflows/tests_freethreading.yml

@@ -0,0 +1,36 @@
+name: Tests Freethreading
+
+on:
+  push:
+  pull_request:
+
+env:
+  PYTEST_ADDOPTS: "--color=yes"
+
+jobs:
+  tests:
+
+    runs-on: ubuntu-latest
+    strategy:
+      matrix:
+        python-version: ['3.13t']
+
+    steps:
+    - name: Checkout
+      uses: actions/checkout@v4
+
+    - name: Set up Python ${{ matrix.python-version }}
+      uses: actions/setup-python@v5
+      with:
+        python-version: ${{ matrix.python-version }}
+
+    - name: Install dependencies
+      run: |
+        python3 -m pip install --upgrade pip doit
+        doit install_test_deps
+        python3 -m pip install .
+        python3 -m pip freeze  # do make debugging easier for failures due to version changes
+
+    - name: Test with pytest
+      run: |
+        doit test