issue usabilla#135

* attempts to add python linting via github actions
* adds flake8 linting triggered on pull request and push

.github/workflows/linting.yml

@@ -0,0 +1,22 @@
+name: Python Linting
+
+on: [push]
+
+jobs:
+  build:
+
+    runs-on: ubuntu-latest
+
+    steps:
+    - uses: actions/checkout@v1
+    - name: Set up Python 3.7
+      uses: actions/setup-python@v1
+      with:
+        python-version: 3.7
+    - name: Lint with flake8
+      run: |
+        pip install flake8
+        # stop the build if there are Python syntax errors or undefined names
+        flake8 . --count --select=E9,F63,F7,F82 --show-source --statistics
+        # exit-zero treats all errors as warnings. The GitHub editor is 127 chars wide
+        flake8 . --count --exit-zero --max-complexity=10 --max-line-length=127 --statistics

README.md

@@ -635,3 +635,4 @@ $ DOCKER_BUILDKIT=1 docker build -t "my-project-prod:latest" \
 ### Working example
 
 We also have a simple, but fully functional PHP FPM example, [check it here](docs/examples/hello-world-fpm).
+