Add support github-action python2.7 by the use of a container (#367)

* Add support github-action python2.7 by the use of a container

See actions/runner-images#7401 (comment)

Author: pitbulk

.github/workflows/python-package.yml

@@ -12,21 +12,20 @@ on:
       - master
 
 jobs:
-  test:
+  test_py3:
     runs-on: ubuntu-20.04
     strategy:
       fail-fast: false
       matrix:
         python-version:
-          - "2.7"
           - "3.5"
           - "3.6"
           - "3.7"
           - "3.8"
           - "3.9"
           - "3.10"
     steps:
-    - uses: actions/checkout@v2
+    - uses: actions/checkout@v3
     - name: Set up Python ${{ matrix.python-version }}
       uses: actions/setup-python@v2
       with:
@@ -46,11 +45,34 @@ jobs:
         make install-test
     - name: Test
       run: make pytest
+  test_py2:
+    runs-on: ubuntu-20.04
+    container:
+      image: python:2.7.18-buster
+    strategy:
+      fail-fast: false
+    steps:
+    - uses: actions/checkout@v3
+    - uses: actions/cache@v2
+      with:
+        path: ~/.cache/pip
+        key: ${{ runner.os }}-pip-${{ hashFiles('**/setup.py') }}
+        restore-keys: |
+          ${{ runner.os }}-pip-
+    - name: Install dependencies
+      run: |
+        pip install -U setuptools
+        apt-get update -qq
+        apt-get install -qq swig python-dev libxml2-dev libxmlsec1-dev
+        make install-req
+        make install-test
+    - name: Test
+      run: make pytest
   lint:
     runs-on: ubuntu-20.04
     environment: CI
     steps:
-    - uses: actions/checkout@v2
+    - uses: actions/checkout@v3
     - uses: actions/setup-python@v2
       with:
         python-version: "3.10"