add ruff

.github/workflows/ci.yml

@@ -7,11 +7,19 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - uses: actions/checkout@v2
+
       - name: Set up Python
         uses: actions/setup-python@v2
         with:
-        python-version: '3.x'
+          python-version: "3.x"
+
       - name: Install dependencies
-      run: pip install -r requirements.txt
+        run: |
+          pip install -r requirements.txt
+          pip install ruff
+
+      - name: Run Ruff
+        run: ruff check .
+
       - name: Run tests
         run: python3 test.py