Run Ruff checks in dedicated workflow job

.github/workflows/python.yml

@@ -44,10 +44,38 @@ jobs:
           python-version: ${{ matrix.python-version }}
 
       - name: Install dependencies
-        run: pip install -r requirements.txt && pip install -r requirements-dev.txt
-
-      - name: Run Ruff check
-        run: ruff check limbo tests
+        run: pip install -r requirements.txt -r requirements-dev.txt
+
+      - name: Install Limbo
+        run: pip install -e .
+
+      - name: Run Pytest
+        run: pytest tests
+
+  lint:
+    runs-on: ubuntu-latest
+
+    defaults:
+      run:
+        working-directory: ${{ env.working-directory }}
+
+    steps:
+      - name: Checkout code
+        uses: actions/checkout@v4
+
+      - name: Set up Python
+        uses: actions/setup-python@v5
+        with:
+          python-version: "3.12"
+
+      - name: Install dev dependencies
+        run: pip install -r requirements-dev.txt
+
+      - name: Run Ruff check
+        run: ruff check
+
+      - name: Run Ruff format check
+        run: ruff format --diff
 
       - name: Install Limbo
         run: pip install -e .