Move python2 check to GitHub Actions (#318)

* Move python2 check to GitHub Actions

* Delete python2.yml

* Rename azure/install_dependencies_python2.sh to ci/install_dependencies_python2.sh

.github/workflows/python2.yml

+name: python2
+
+on: [push]
+
+jobs:
+  build:
+
+    runs-on: ubuntu-latest
+    strategy:
+      max-parallel: 4
+      matrix:
+        python-version: [2.7]
+
+    steps:
+    - uses: actions/checkout@v1
+    - name: Set up Python ${{ matrix.python-version }}
+      uses: actions/setup-python@v1
+      with:
+        python-version: ${{ matrix.python-version }}
+    - name: Install dependencies
+      run: |
+        ci/install_dependencies_python2.sh
+        pip install .
+    - name: Run minimum python2 tests
+      run: |
+        python2 examples/energy_force.py
+        python2 examples/ase_interface.py

azure/python2.yml

-queue:
-  name: Hosted Ubuntu 1604
-  timeoutInMinutes: 30
-
-trigger:
-  batch: true
-  branches:
-    include:
-    - master
-
-variables:
-  python.version: '2.7'
-
-
-steps:
-
-- task: UsePythonVersion@0
-  displayName: 'Use Python $(python.version)'
-  inputs:
-    versionSpec: '$(python.version)'
-
-- script: 'azure/install_dependencies_python2.sh && pip install .'
-  displayName: 'Install dependencies'
-
-- script: 'python2 examples/energy_force.py'
-  displayName: Energy and Force Example
-
-- script: 'python2 examples/ase_interface.py'
-  displayName: ASE Interface Example