Run flake8 in CI

Author: ondras12345

.github/workflows/Test.yml

@@ -38,13 +38,17 @@ jobs:
       - name: Install dependencies
         run: |
           python -m pip install --upgrade pip
-          pip install . pytest pytest-md pytest-emoji
+          pip install . pytest pytest-md pytest-emoji flake8
 
       - name: Set timezone
         uses: szenius/set-timezone@v2.0
         with:
           timezoneLinux: 'Europe/Berlin'
 
+      - name: Lint with flake8
+        run: |
+          flake8 . --count --statistics
+
       - name: Run pytest
         uses: pavelzw/pytest-action@v2
         with: