update actions.

.github/workflows/test-ci.yml

@@ -8,28 +8,24 @@ on:
 
 jobs:
   test2:
-    runs-on: ubuntu-20.04
+    runs-on: ubuntu-latest
+    container: coatldev/six:latest
 
     strategy:
       matrix:
-        python-version: [2.6, 2.7]  # Specify the desired Python versions
+        python-version: [2.7]  # Specify the desired Python versions
 
     steps:
       - name: Checkout code
         uses: actions/checkout@v2
 
-      - name: Set up Python
-        uses: actions/setup-python@v1
-        with:
-          python-version: ${{ matrix.python-version }}
-
       - name: Install dependencies
         run: |
-          pip install mock future
-          pip install .
+          python2 -m pip install mock future
+          python2 -m pip install .
 
       - name: Run tests
-        run: python -m unittest discover -s tests
+        run: python2 -m unittest discover -s tests
 
 
   test3: