chore(ci): separate build & publish and add lint

.github/workflows/python.yml

@@ -18,8 +18,30 @@ concurrency:
   cancel-in-progress: true
 
 jobs:
+  test:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+      - uses: actions/setup-python@v5
+        with:
+          python-version: '3.12'
+          cache: 'pipenv'
+      - name: Lint
+        working-directory: python
+        run: |
+          pipenv install --dev
+          pipenv run flake8 databend_udf
+          pipenv run black --check databend_udf
+      - name: build
+        working-directory: python
+        run: |
+          python -m pip install build
+          python -m build
+
   publish:
     runs-on: ubuntu-latest
+    needs: test
+    if: github.event_name == 'push'
     permissions:
       contents: read
       id-token: write
@@ -34,7 +56,6 @@ jobs:
           python -m pip install build
           python -m build
       - uses: pypa/gh-action-pypi-publish@release/v1
-        if: github.event_name == 'push'
         with:
           packages-dir: python/dist/
           skip-existing: true