add pyflake8 setup

.github/workflows/main.yaml

@@ -7,11 +7,16 @@ on:
     branches: ["main"]
 
 jobs:
-  
   test:
+    runs-on: ubuntu-latest
     steps:
       - name: Checkout repository
         uses: actions/checkout@v5.0.0
 
       - name: Run tests
         run: python3 test_main.py
+
+      - name: setup pyflake8
+        run: |
+          python -m pip install flake8
+