Add publish to PyPi github action.

PiperOrigin-RevId: 371913917
Change-Id: Ia4bea658b0194116b69eeb9f2f279721b3df7993

Author: tomwardio

.github/workflows/publish-to-pypi.yml

@@ -0,0 +1,36 @@
+# This workflow will upload a Python Package using Twine when a release is created.
+# For more information see: https://help.github.com/en/actions/language-and-framework-guides/using-python-with-github-actions#publishing-to-package-registries
+
+name: Upload Python Package
+
+on:
+  release:
+    types: [created]
+  workflow_dispatch:
+
+jobs:
+  deploy:
+
+    runs-on: ubuntu-latest
+
+    steps:
+    - uses: actions/checkout@v2
+    - name: Set up Python
+      uses: actions/setup-python@v2
+      with:
+        python-version: '3.7'
+    - name: Add repository sub-modules
+      run: |
+        git submodule init
+        git submodule update
+    - name: Install dependencies
+      run: |
+        python -m pip install --upgrade pip
+        pip install setuptools wheel twine
+    - name: Build and publish
+      env:
+        TWINE_USERNAME: ${{ secrets.PYPI_USERNAME }}
+        TWINE_PASSWORD: ${{ secrets.PYPI_PASSWORD }}
+      run: |
+        python setup.py sdist bdist_wheel
+        twine upload dist/*