setup router python binding ci (#1999)

rust/README.md

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+# SGLang Router (Experimental)
+
+SGLang router is a standalone module implemented in Rust to achieve data parallelism across SGLang instances.
+
+## Prerequisites
+
+- Rust and Cargo installed
+
+```bash
+# Install rustup (Rust installer and version manager)
+curl --proto '=https' --tlsv1.2 -sSf https://sh.rustup.rs | sh
+
+# Follow the installation prompts, then reload your shell
+source $HOME/.cargo/env
+
+# Verify installation
+rustc --version
+cargo --version
+```
+
+- Python with pip installed
+
+## Build Process
+
+### 1. Build Rust Project
+
+```bash
+cargo build
+```
+
+### 2. Build Python Binding
+
+#### Option A: Build and Install Wheel
+1. Build the wheel package:
+```bash
+pip install setuptools-rust wheel build
+python -m build
+```
+
+2. Install the generated wheel:
+```bash
+pip install <path-to-wheel>
+```
+
+#### Option B: Development Mode
+
+For development purposes, you can install the package in editable mode:
+```bash
+pip install -e .
+```
+
+**Note:** When modifying Rust code, you must rebuild the wheel for changes to take effect.
+
+## CI/CD Setup
+
+The continuous integration pipeline consists of three main steps:
+
+### 1. Build Wheels
+- Uses `cibuildwheel` to create manylinux x86_64 packages
+- Compatible with major Linux distributions (Ubuntu, CentOS, etc.)
+- Additional configurations can be added to support other OS/architectures
+- Reference: [cibuildwheel documentation](https://cibuildwheel.pypa.io/en/stable/)
+
+### 2. Build Source Distribution
+- Creates a source distribution containing the raw, unbuilt code
+- Enables `pip` to build the package from source when prebuilt wheels are unavailable
+
+### 3. Publish to PyPI
+- Uploads both wheels and source distribution to PyPI
+
+The CI configuration is based on the [tiktoken workflow](https://github.com/openai/tiktoken/blob/63527649963def8c759b0f91f2eb69a40934e468/.github/workflows/build_wheels.yml#L1).