Add Github Action for lint (#1321)

.github/workflows/lint.yml

@@ -0,0 +1,33 @@
+# This workflow will install Python dependencies, run tests and lint with a single version of Python
+# For more information see: https://help.github.com/actions/language-and-framework-guides/using-python-with-github-actions
+
+name: CTFd CI
+
+on:
+  push:
+    paths:
+    - '**.py'
+
+jobs:
+  build:
+
+    runs-on: ubuntu-latest
+    strategy:
+      matrix:
+        python-version: ['2.7', '3.6']
+
+    name: Python ${{ matrix.python-version }}
+    steps:
+      - uses: actions/checkout@v2
+      - name: Setup python
+        uses: actions/setup-python@v1
+        with:
+          python-version: ${{ matrix.python-version }}
+          architecture: x64
+      - name: Install dependencies
+        run: |
+            python -m pip install --upgrade pip
+            pip install -r development.txt
+      - name: Lint
+        run: |
+            make lint