ci: add GitHub actions for linting and testing

Author: rodrigomelo9

.github/workflows/test.yml

@@ -0,0 +1,30 @@
+name: 'test'
+
+on:
+  push:
+
+jobs:
+  test:
+    runs-on: ubuntu-latest
+    strategy:
+      matrix:
+        python-version: [3.6, 3.7, 3.8, 3.9]
+    steps:
+    - uses: actions/checkout@v2
+    - name: Set up Python ${{ matrix.python-version }}
+      uses: actions/setup-python@v2
+      with:
+        python-version: ${{ matrix.python-version }}
+    - name: Install dependencies
+      run: |
+        pip install pycodestyle
+        pip install pylint
+        pip install pytest
+        pip install .
+    - name: Lint
+      run: |
+        pycodestyle openflow
+        pylint -s n openflow
+        git diff --check --cached
+    - name: Test
+      run: pytest test