feat: add GitHub Actions workflow for ruff lint and format checks

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

Author: tmgbedu

.github/workflows/lint.yml

@@ -0,0 +1,34 @@
+name: Lint
+
+on:
+  push:
+    branches: ["**"]
+  pull_request:
+    branches: ["**"]
+
+jobs:
+  ruff:
+    name: Ruff
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+
+      - name: Install uv
+        uses: astral-sh/setup-uv@v5
+
+      - name: Set up Python
+        uses: actions/setup-python@v5
+        with:
+          python-version: "3.12"
+
+      - name: Install dependencies
+        working-directory: fastapi_startkit
+        run: uv sync --group dev
+
+      - name: Run ruff check
+        working-directory: fastapi_startkit
+        run: uv run ruff check .
+
+      - name: Run ruff format check
+        working-directory: fastapi_startkit
+        run: uv run ruff format --check .