Add PyPI GitHub workflow.

PiperOrigin-RevId: 384917302

.github/workflows/pypi-publish.yml

@@ -0,0 +1,34 @@
+name: pypi
+
+on:
+  release:
+    types: [created]
+
+jobs:
+  deploy:
+    runs-on: ubuntu-latest
+    steps:
+    - uses: actions/checkout@v2
+    - name: Set up Python
+      uses: actions/setup-python@v1
+      with:
+        python-version: '3.x'
+    - name: Check consistency between the package version and release tag
+      run: |
+        RELEASE_VER=${GITHUB_REF#refs/*/}
+        PACKAGE_VER="v`python setup.py --version`"
+        if [ $RELEASE_VER != $PACKAGE_VER ]
+        then
+          echo "package ver. ($PACKAGE_VER) != release ver. ($RELEASE_VER)"; exit 1
+        fi
+    - 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/*