ci(tests): Add ruff format checking

Author: tony

.github/workflows/tests.yml

@@ -51,8 +51,10 @@ jobs:
           poetry install -E "test coverage lint"
 
       - name: Lint with ruff
-        run: |
-          poetry run ruff .
+        run: poetry run ruff .
+
+      - name: Format with ruff
+        run: poetry run ruff format . --check
 
       - name: Lint with mypy
         run: poetry run mypy .