feat: Add CI workflow for linting and testing on PRs

.github/workflows/ci.yml

@@ -0,0 +1,60 @@
+name: CI
+
+on:
+  push:
+    branches: [main]
+  pull_request:
+    branches: [main]
+
+jobs:
+  lint:
+    name: Lint & Format
+    runs-on: ubuntu-latest
+
+    steps:
+      - uses: actions/checkout@v4
+
+      - name: Set up Python
+        uses: actions/setup-python@v5
+        with:
+          python-version: '3.12'
+
+      - name: Install uv
+        run: pip install uv
+
+      - name: Install dependencies
+        run: |
+          uv sync
+          uv pip install -e ".[dev]"
+
+      - name: Run linting
+        run: uv run ruff check .
+
+      - name: Run formatting check
+        run: uv run ruff format --check .
+
+  test:
+    name: Test (Python ${{ matrix.python-version }})
+    runs-on: ubuntu-latest
+    strategy:
+      matrix:
+        python-version: ['3.10', '3.11', '3.12', '3.13']
+
+    steps:
+      - uses: actions/checkout@v4
+
+      - name: Set up Python ${{ matrix.python-version }}
+        uses: actions/setup-python@v5
+        with:
+          python-version: ${{ matrix.python-version }}
+
+      - name: Install uv
+        run: pip install uv
+
+      - name: Install dependencies
+        run: |
+          uv sync
+          uv pip install -e ".[dev]"
+
+      - name: Run tests
+        run: uv run pytest tests/ -v --cov=src/clgraph --cov-report=term-missing