feat: support sgl-kernel PyPI (#2433)

Co-authored-by: Zhangyi <1109276519@qq.com>

.github/workflows/release-pypi-kernel.yml

@@ -0,0 +1,37 @@
+name: Release SGLang Kernel to PyPI
+
+on:
+  push:
+    branches:
+      - main
+    paths:
+      - sgl-kernel/pyproject.toml
+  workflow_dispatch:
+
+jobs:
+  build-wheels:
+    runs-on: ubuntu-latest
+    strategy:
+      matrix:
+        python-version: ['3.9', '3.10', '3.11', '3.12']
+        cuda-version: ['11.8', '12.1', '12.4']
+
+    steps:
+    - uses: actions/checkout@v4
+
+    - name: Set up Python ${{ matrix.python-version }}
+      uses: actions/setup-python@v5
+      with:
+        python-version: ${{ matrix.python-version }}
+
+    - name: Build wheels for Python ${{ matrix.python-version }} and CUDA ${{ matrix.cuda-version }}
+      run: |
+        cd sgl-kernel
+        chmod +x ./build.sh
+        ./build.sh "${{ matrix.python-version }}" "${{ matrix.cuda-version }}"
+
+    - name: Upload to pypi
+      working-directory: sgl-kernel
+      run: |
+        pip install twine
+        python3 -m twine upload dist/* -u __token__ -p ${{ secrets.PYPI_TOKEN }}