add python seprate release artifact (#46)

Author: wanlin31

.github/workflows/release-python-sdk.yml

@@ -0,0 +1,45 @@
+# .github/workflows/release-python-sdk.yml
+
+name: Release Python SDK
+
+# This workflow runs when a tag starting with 'sdks/python/v' is pushed
+on:
+  push:
+    tags:
+      - 'sdks/python/v*'
+  workflow_dispatch:
+
+permissions:
+  contents: write
+
+jobs:
+  build-and-upload:
+    name: Build Python SDK artifact
+    runs-on: ubuntu-latest
+
+    steps:
+      - name: Checkout repository
+        uses: actions/checkout@v4
+
+      - name: Set up Python
+        uses: actions/setup-python@v5
+        with:
+          python-version: '3.10'
+
+      - name: Install build dependencies
+        run: pip install build twine
+
+      - name: Build Python wheel and source distribution
+        run: python3 -m build
+        working-directory: ./sdks/python
+
+      - name: Create GitHub Release and Upload Artifacts
+        uses: softprops/action-gh-release@v2
+        with:
+          # This will upload all files from the build output directory
+          # (e.g., your-package-0.2.0-py3-none-any.whl and your-package-0.2.0.tar.gz)
+          files: sdks/python/dist/*
+          # This will create a draft release require teammate to manually publish, once
+          # we are confident with the release process, we can set draft: false, which
+          # will automatic create the release.
+          draft: true

CONTRIBUTING.md

@@ -91,3 +91,28 @@ After a new `test-server` binary is released, you need to update the checksums p
 6.  Publish the new version to npm following internal guidance at go/wombat-dressing-room. (When prompted,
     create a package specific publish token for  `test-server-sdk`.)
   
+### Release python sdk
+
+Publishing Python sdk is a relatively independent process, you can release python sdk without
+any change on golang `test-server` binary.
+
+1.  Ensure your local `main` branch is up-to-date and clean:
+    ```sh
+    git checkout main && git pull origin main && git clean -xdf
+    ```
+2. Update the version in `sdks/python/pyproject.toml`, create and merge the PR.
+    ```
+    git add .
+    git commit -m "chore: Prepare for Python SDK release v0.1.0"
+    git push origin release/python-v0.1.0
+    ```
+4. Find the current version of the python sdk in `sdks/python/pyproject.toml`. And
+   find the current golang test-server version, make sure 
+    `sdks/python/src/test-server-sdk/checksums.json` include this version.
+3.  Create and push a new version tag. For example, for version `sdks/python/v0.1.0-core.0.2.8`:
+    ```sh
+    git tag -a sdks/python/v0.1.0-core.0.2.8 -m "Release Python SDK v0.1.0 for Core v0.2.8"
+    git push origin sdks/python/v0.1.0-core.0.2.8
+    ```
+4. Find the draft release, verify the executable is built and uplaoaded successfully.
+5. Publish the relase