feat: add flake8 linting step to GitHub Actions workflow

Author: PythonicVarun

.github/workflows/tests.yml

@@ -24,8 +24,14 @@ jobs:
       - name: Install dependencies
         run: |
           python -m pip install --upgrade pip
+          python -m pip install flake8
           pip install .
 
+      - name: Lint with flake8
+        run: |
+          flake8 . --count --select=E9,F63,F7,F82 --show-source --statistics
+          flake8 . --count --exit-zero --max-complexity=10 --max-line-length=127 --statistics
+
       - name: Run tests
         run: |
           python -m unittest discover tests