Feature Request: There is no source release on PyPi

### Describe the issue

There is no source release on PyPi: https://onnxruntime.ai/

### To reproduce

download the tarball and see that it does not include the source code

### Urgency

no

### Platform

Linux

### OS Version

latest

### ONNX Runtime Installation

Released Package

### ONNX Runtime Version or Commit ID

latest

### ONNX Runtime API

Other / Unknown

### Architecture

X64

### Execution Provider

Default CPU

### Execution Provider Library Version

_No response_

Start by inspecting the ONNX Runtime released package and its PyPI source tarball, then trace the release and packaging configuration that produces them. No file, test, or entry point is named; done means a source release containing the source code is published on PyPI and can be verified by downloading the tarball.

Written by the indexing model from the issue text.