add tmate

Author: mihalicyn

.github/workflows/tests.yml

@@ -274,3 +274,11 @@ jobs:
         with:
           token: ${{ secrets.CODECOV_TOKEN }}
           verbose: true
+
+      - name: Tmate debugging session
+        if: ${{ failure() }}
+        timeout-minutes: 60
+        uses: mxschmitt/action-tmate@c0afd6f790e3a5564914980036ebf83216678101 # v3.23
+        with:
+          # Never allow public SSH access
+          limit-access-to-actor: true