Add flake8 Github Action

.github/workflows/flake8.yml

@@ -0,0 +1,16 @@
+name: Flake8
+on: pull_request
+jobs:
+  flake8:
+    name: Check code with Flake8
+    runs-on: ubuntu-20.04
+    container: fedora:32
+    steps:
+      - name: Install Pipenv and Git
+        run: dnf install -y pipenv git
+      - name: Checkout code
+        uses: actions/checkout@v2
+      - name: Setup environment
+        run: pipenv sync --dev
+      - name: Run Flake8
+        run: pipenv run flake8 --max-line-length 120

Pipfile

@@ -4,6 +4,7 @@ url = "https://pypi.org/simple"
 verify_ssl = true
 
 [dev-packages]
+flake8 = "*"
 
 [packages]
 django = "*"