PYTHON-3745 Upload core files and enable tmate on actions

.github/workflows/test-python.yml

@@ -42,6 +42,12 @@ jobs:
     name: CPython ${{ matrix.python-version }}-${{ matrix.os }}
     steps:
       - uses: actions/checkout@v4
+      - name: Setup tmate session
+        uses: mxschmitt/action-tmate@v3
+        timeout-minutes: 5
+        with:
+          detached: true
+          limit-access-to-actor: true
       - name: Setup Python
         uses: actions/setup-python@v5
         with:
@@ -55,9 +61,22 @@ jobs:
         uses: supercharge/[email protected]
         with:
           mongodb-version: 4.4
+      - name: Set cores to get stored in /cores
+        run: |
+          sudo mkdir /cores
+          sudo chmod 777 /cores
+          # Core filenames will be of the form executable.pid.timestamp:
+          sudo bash -c 'echo "/cores/%e.%p.%t" > /proc/sys/kernel/core_pattern'
       - name: Run tests
         run: |
+          # Allow core dumps
+          ulimit -c unlimited
           tox -m test
+      - uses: actions/upload-artifact@v3
+        if: ${{ failure() }}
+        with:
+          name: cores
+          path: /cores
 
   doctest:
     runs-on: ubuntu-latest