ci: Add PyPi workflow

.github/workflows/pypi.yml

@@ -0,0 +1,25 @@
+name: Publish to PyPi
+on:
+  push:
+    branches:
+      - pypi
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v2
+      - uses: actions/setup-python@v1
+        with:
+          python-version: 3.6
+      - run: pip install --upgrade setuptools wheel
+      - run: python setup.py sdist bdist_wheel
+      - name: Publish to TestPyPI
+        uses: pypa/gh-action-pypi-publish@release/v1
+        with:
+          password: ${{ secrets.TEST_PYPI_API_TOKEN }}
+          repository_url: https://test.pypi.org/legacy/
+      - name: Publish to PyPI
+        if: startsWith(github.ref, 'refs/tags')
+        uses: pypa/gh-action-pypi-publish@release/v1
+        with:
+          password: ${{ secrets.PYPI_API_TOKEN }}