ci: add GitHub Actions workflow (test + lint)

.github/workflows/ci.yml

@@ -0,0 +1,60 @@
+name: CI
+
+on:
+  pull_request:
+    branches: [main]
+  push:
+    branches: [main]
+
+permissions:
+  contents: read
+
+jobs:
+  test:
+    name: Test
+    runs-on: ubuntu-latest
+    timeout-minutes: 20
+    steps:
+      - uses: actions/checkout@v4
+        with:
+          fetch-depth: 0
+
+      - uses: actions/setup-python@v5
+        with:
+          python-version: "3.12"
+          cache: pip
+
+      - name: Install dependencies
+        run: |
+          pip install -r requirements.txt
+          pip install pytest pytest-asyncio pytest-cov ruff
+          pip install -e . --no-deps
+
+      - name: Run tests
+        run: pytest -p no:cacheprovider -o addopts="" tests/ -q
+
+  lint:
+    name: Lint
+    runs-on: ubuntu-latest
+    timeout-minutes: 10
+    steps:
+      - uses: actions/checkout@v4
+        with:
+          fetch-depth: 0
+
+      - uses: actions/setup-python@v5
+        with:
+          python-version: "3.12"
+
+      - name: Install ruff
+        run: pip install ruff
+
+      - name: Ruff check changed files
+        run: |
+          git diff --name-only "${{ github.event.pull_request.base.sha }}...${{ github.event.pull_request.head.sha }}" -- '*.py' \
+            | xargs -r ruff check --output-format=github
+
+      - name: Ruff format check changed files
+        run: |
+          git diff --name-only "${{ github.event.pull_request.base.sha }}...${{ github.event.pull_request.head.sha }}" -- '*.py' \
+            | xargs -r ruff format --check