Migrate PyPI release to GitHub Actions

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

@@ -0,0 +1,32 @@
+name: Publish to PyPI
+
+on: push
+
+jobs:
+  publish-pypi:
+    name: Publish to PyPI
+    runs-on: ubuntu-latest
+
+    steps:
+    - name: Checkout
+      uses: actions/checkout@master
+
+    - name: Set up Python
+      uses: actions/setup-python@v1
+      with:
+        python-version: 3.8
+
+    - name: Build source distributions and wheels
+      run: python setup.py bdist_wheel
+
+    - name: Publish to Test PyPI
+      uses: pypa/gh-action-pypi-publish@master
+      with:
+        password: ${{ secrets.test_pypi_password }}
+        repository_url: https://test.pypi.org/legacy/
+
+    - name: Publish to PyPI
+      if: startsWith(github.ref, 'refs/tags')
+      uses: pypa/gh-action-pypi-publish@master
+      with:
+        password: ${{ secrets.pypi_password }}