Dev: workflows: Run unit test with python container

As ubuntu-24.04 not support python3.6 directly, to keep consistency,
we use python container to run unit test for all python versions.

Author: liangxin1300

.github/workflows/crmsh-ci.yml

@@ -37,17 +37,14 @@ jobs:
     timeout-minutes: 5
     steps:
     - uses: actions/checkout@v4
-    - name: Set up Python
-      uses: actions/setup-python@v4
-      with:
-        python-version: ${{ matrix.python-version }}
-    - name: Install dependencies
-      run: |
-        python -m pip install --upgrade pip
-        pip install tox
-    - name: Test with pytest in tox
+    - name: Run unit tests in Python container
       run: |
+        docker run --rm -v ${{ github.workspace }}:/app -w /app python:${{ matrix.python-version }} bash -c "
+        python -m pip install --upgrade pip &&
+        pip install tox &&
         tox -v -e${{ matrix.python-version }}
+        "
+
     - uses: codecov/codecov-action@v4
       with:
         token: ${{ secrets.CODECOV_TOKEN }}