[router] fix router release workflow and add build test in PR (#12315)

.github/workflows/pr-test-rust.yml

@@ -21,6 +21,55 @@ env:
   SCCACHE_GHA_ENABLED: "true"
 
 jobs:
+  maturin-build-test:
+    if: github.event_name != 'pull_request' || contains(github.event.pull_request.labels.*.name, 'run-ci')
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+        with:
+          path: sglang-repo
+
+      - name: Move sgl-router folder to root
+        run: |
+          mv sglang-repo/sgl-router/* .
+          rm -rf sglang-repo
+
+      - name: Set up Python
+        uses: actions/setup-python@v5
+        with:
+          python-version: "3.13"
+
+      - name: Install protoc and dependencies
+        run: |
+          sudo apt-get update
+          sudo apt-get install -y wget unzip gcc g++ perl make
+          cd /tmp
+          wget https://github.com/protocolbuffers/protobuf/releases/download/v32.0/protoc-32.0-linux-x86_64.zip
+          sudo unzip protoc-32.0-linux-x86_64.zip -d /usr/local
+          rm protoc-32.0-linux-x86_64.zip
+          protoc --version
+
+      - name: Configure sccache
+        uses: mozilla-actions/sccache-action@v0.0.9
+        with:
+          version: "v0.10.0"
+
+      - name: Test maturin build
+        uses: PyO3/maturin-action@v1
+        with:
+          args: --release --out dist
+          rust-toolchain: stable
+          sccache: true
+
+      - name: List built wheel
+        run: ls -lh dist/
+
+      - name: Test wheel install
+        run: |
+          pip install dist/*.whl
+          python -c "import sglang_router; print('Python package: OK')"
+          python -c "from sglang_router.sglang_router_rs import Router; print('Rust extension: OK')"
+          python -m sglang_router.launch_router --help > /dev/null && echo "Entry point: OK"
   unit-test-rust:
     if: github.event_name != 'pull_request' || contains(github.event.pull_request.labels.*.name, 'run-ci')
     runs-on: ubuntu-latest
@@ -116,8 +165,8 @@ jobs:
           source "$HOME/.cargo/env"
           export RUSTC_WRAPPER=sccache
           cd sgl-router
-          pip install setuptools-rust wheel build
-          python3 -m build
+          pip install maturin
+          maturin build --release --out dist
           pip install --force-reinstall dist/*.whl
 
 
@@ -213,8 +262,8 @@ jobs:
           source "$HOME/.cargo/env"
           export RUSTC_WRAPPER=sccache
           cd sgl-router
-          pip install setuptools-rust wheel build
-          python3 -m build
+          pip install maturin
+          maturin build --release --out dist
           pip install --force-reinstall dist/*.whl
 
       - name: Run Python E2E response API tests
@@ -237,7 +286,7 @@ jobs:
 
 
   finish:
-    needs: [unit-test-rust, pytest-rust, pytest-rust-2]
+    needs: [maturin-build-test, unit-test-rust, pytest-rust, pytest-rust-2]
     runs-on: ubuntu-latest
     steps:
       - name: Finish