ci: add ruff format --check step to lint workflow

- Introduce `ruff format --check` to the CI pipeline to enforce code formatting rules

Author: RandomProgramm3r

.github/workflows/linting.yml

@@ -25,3 +25,4 @@ jobs:
         uses: astral-sh/ruff-action@v3.2.2
         with:
           github-token: ${{ secrets.GITHUB_TOKEN }}
+      - run: ruff format --check