Add workflow for pushing to PyPI

.github/workflows/release.yml

@@ -0,0 +1,36 @@
+name: Release
+
+on: [push, release]
+
+jobs:
+
+  push_release_to_pypi:
+    name: Push Package Release to PyPI
+    runs-on: ubuntu-18.04
+    steps:
+
+      - uses: actions/checkout@v2
+
+      - uses: actions/setup-python@v2
+        name: Install Python 3.8
+        with:
+          python-version: 3.8
+
+      - name: Install Tox
+        run: pip install tox
+
+      - name: Build Source and Wheel Package
+        run: |
+          tox -e run-cmd -- python setup.py sdist
+          tox -e run-cmd -- python setup.py bdist_wheel
+
+      - name: Check distribution files
+        run: tox -e run-cmd -- twine check dist/*
+
+      - name: Publish package to Test-PyPI
+        if: github.event_name == 'release'
+        uses: pypa/gh-action-pypi-publish@master
+        with:
+          user: __token__
+          password: ${{ secrets.TEST_PYPI_API_TOKEN }}
+          repository_url: https://test.pypi.org/legacy/