Temporarily add tmate to action for debugging

Author: puddly

.github/workflows/ci.yml

@@ -224,7 +224,7 @@ jobs:
     needs: prepare-base
     strategy:
       matrix:
-        python-version: [3.8, 3.9, "3.10", "3.11"]
+        python-version: ["3.11"]
     name: >-
       Run tests Python ${{ matrix.python-version }}
     steps:
@@ -259,6 +259,11 @@ jobs:
           # However this plugin is fairly new and doesn't run correctly
           # on a non-GitHub environment.
           pip install pytest-github-actions-annotate-failures
+      - name: Setup tmate session
+        uses: mxschmitt/action-tmate@v3
+        with:
+          sudo: false
+          limit-access-to-actor: true
       - name: Run pytest
         run: |
           . venv/bin/activate