[gRPC] Native gRPC server: proto + Rust crate scaffold + server args (#22736)

.github/workflows/pr-test.yml

@@ -639,6 +639,14 @@ jobs:
       - name: Install uv
         uses: astral-sh/setup-uv@v5
 
+      # Needed by setuptools-rust to build the bundled native gRPC extension
+      # (rust/sglang-grpc) when installing the main `sglang` wheel from source.
+      - name: Install protoc
+        run: sudo bash scripts/ci/utils/install_protoc.sh
+
+      - name: Install Rust toolchain
+        run: bash scripts/ci/utils/install_rustup.sh
+
       # uv pip targets a venv by default; setup-python has no venv — install into that interpreter (see UV_SYSTEM_PYTHON in https://docs.astral.sh/uv/guides/integration/github/)
       - name: Install dependencies
         timeout-minutes: 20