ci: add GitHub Actions workflow for lint and smoke test

.github/workflows/ci.yml

@@ -0,0 +1,39 @@
+name: CI
+
+on:
+  push:
+    branches: [master, feature/v2]
+  pull_request:
+    branches: [master, feature/v2]
+
+jobs:
+  lint:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+      - uses: actions/setup-python@v5
+        with:
+          python-version: '3.13'
+      - run: pip install ruff==0.15.5
+      - run: ruff check --select F --ignore F401 --exclude "*/grpcauto/*" v2/
+
+  smoke-test:
+    runs-on: ubuntu-latest
+    strategy:
+      matrix:
+        python-version: ['3.9', '3.11', '3.13']
+    steps:
+      - uses: actions/checkout@v4
+      - uses: actions/setup-python@v5
+        with:
+          python-version: ${{ matrix.python-version }}
+      - run: pip install -r requirements.txt
+      - name: Smoke test v1 module
+        if: hashFiles('nacos/__init__.py') != ''
+        run: python -c "import nacos; print('v1 import ok')"
+        env:
+          PYTHONPATH: .
+      - name: Smoke test v2 module
+        run: python -c "import v2.nacos; print('v2 import ok')"
+        env:
+          PYTHONPATH: .