[router][ci] Add Nightly Release Workflow for SGLang Router (#11527)

.github/workflows/nightly-release-router.yml

+# Nightly release workflow for SGLang Router
+
+name: Nightly Release SGLang Router to PyPI
+
+on:
+  schedule:
+    # Run at 2 AM UTC every day
+    - cron: '0 2 * * *'
+  workflow_dispatch:  # Allow manual trigger
+
+jobs:
+  build:
+    name: Build on ${{ matrix.os }} (${{ matrix.target }})
+    runs-on: ${{ matrix.os }}-latest
+    strategy:
+      fail-fast: false
+      matrix:
+        include:
+          - os: ubuntu
+            target: x86_64
+
+    steps:
+      - uses: actions/checkout@v4
+        with:
+          path: sglang-repo
+
+      - name: Move sgl-router folder to root and delete sglang-repo
+        run: |
+          mv sglang-repo/sgl-router/* .
+          rm -rf sglang-repo
+          ls -alt
+
+      - name: Set up Python
+        uses: actions/setup-python@v5
+        with:
+          python-version: "3.11"
+
+      - name: Modify version for nightly release
+        run: |
+          # Get current version from pyproject.toml
+          CURRENT_VERSION=$(python -c "import tomllib; print(tomllib.load(open('pyproject.toml', 'rb'))['project']['version'])" 2>/dev/null || python -c "import tomli; print(tomli.load(open('pyproject.toml', 'rb'))['project']['version'])")
+          # Create nightly version with date: e.g., 0.1.9.dev20250112
+          NIGHTLY_VERSION="${CURRENT_VERSION}.dev$(date +%Y%m%d)"
+          echo "Nightly version: $NIGHTLY_VERSION"
+
+          # Update pyproject.toml with nightly version (temporary, not committed)
+          sed -i "s/version = \"${CURRENT_VERSION}\"/version = \"${NIGHTLY_VERSION}\"/" pyproject.toml
+
+          # Verify the change
+          cat pyproject.toml | grep "^version"
+
+      - name: Install build dependencies
+        run: |
+          python -m pip install -U pip
+          python -m pip install build twine auditwheel tomli
+
+      - name: Build package
+        uses: pypa/cibuildwheel@v2.21.3
+        env:
+          CIBW_BUILD: "cp38-manylinux_x86_64 cp39-manylinux_x86_64 cp310-manylinux_x86_64 cp311-manylinux_x86_64 cp312-manylinux_x86_64"
+          CIBW_BEFORE_ALL: |
+            yum update -y && yum install -y openssl-devel wget unzip && \
+            # Install latest protoc (v32.0) that supports proto3
+            cd /tmp && \
+            wget https://github.com/protocolbuffers/protobuf/releases/download/v32.0/protoc-32.0-linux-x86_64.zip && \
+            unzip protoc-32.0-linux-x86_64.zip -d /usr/local && \
+            rm protoc-32.0-linux-x86_64.zip && \
+            # Install Rust
+            curl --proto '=https' --tlsv1.2 -sSf https://sh.rustup.rs | sh -s -- -y
+          CIBW_ENVIRONMENT: "PATH=$HOME/.cargo/bin:$PATH"
+
+      - name: List built packages
+        run: ls -lh wheelhouse/
+
+      - name: Check packages
+        run: twine check --strict wheelhouse/*
+
+      - uses: actions/upload-artifact@v4
+        with:
+          name: packages-${{ matrix.os }}-${{ matrix.target }}
+          path: wheelhouse/
+
+  build-sdist:
+    name: Build SDist
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+        with:
+          path: sglang-repo
+
+      - name: Move sgl-router folder to root, copy the license file, and delete sglang-repo
+        run: |
+          mv sglang-repo/sgl-router/* .
+          mv sglang-repo/LICENSE .
+          rm -rf sglang-repo
+          ls -alt
+
+      - name: Set up Python
+        uses: actions/setup-python@v5
+        with:
+          python-version: "3.11"
+
+      - name: Modify version for nightly release
+        run: |
+          # Get current version from pyproject.toml
+          CURRENT_VERSION=$(python -c "import tomllib; print(tomllib.load(open('pyproject.toml', 'rb'))['project']['version'])" 2>/dev/null || python -c "import tomli; print(tomli.load(open('pyproject.toml', 'rb'))['project']['version'])")
+          # Create nightly version with date: e.g., 0.1.9.dev20250112
+          NIGHTLY_VERSION="${CURRENT_VERSION}.dev$(date +%Y%m%d)"
+          echo "Nightly version: $NIGHTLY_VERSION"
+
+          # Update pyproject.toml with nightly version (temporary, not committed)
+          sed -i "s/version = \"${CURRENT_VERSION}\"/version = \"${CURRENT_VERSION}\"/g" pyproject.toml
+          sed -i "0,/version = \"${CURRENT_VERSION}\"/s//version = \"${NIGHTLY_VERSION}\"/" pyproject.toml
+
+          # Verify the change
+          cat pyproject.toml | grep "^version"
+
+      - name: Build SDist
+        run: |
+          pip install build
+          python -m pip install -U packaging tomli
+          python -m build --sdist
+
+      - uses: actions/upload-artifact@v4
+        with:
+          name: sdist
+          path: dist/*.tar.gz
+
+  upload:
+    name: Upload to TestPyPI
+    if: github.repository == 'sgl-project/sglang'  # Ensure this job only runs for the sgl-project/sglang repository
+    needs: [build, build-sdist]
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/download-artifact@v4
+        with:
+          path: dist
+          merge-multiple: true
+
+      - name: Upload to TestPyPI
+        env:
+          TWINE_USERNAME: __token__
+          TWINE_PASSWORD: ${{ secrets.TEST_PYPI_TOKEN_ROUTER }}
+        run: |
+          pip install twine
+          twine upload --repository testpypi dist/* --verbose