Add GitHub action to publish to PyPI

.github/workflows/publish.yml

@@ -0,0 +1,34 @@
+name: Publish to PyPI
+
+on:
+  release:
+    types: [released, prereleased]
+
+permissions:
+  contents: read # to fetch code (actions/checkout)
+
+jobs:
+  build_and_publish:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v3
+        with:
+          fetch-depth: 0
+
+      - name: Set up Python 3.8
+        uses: actions/setup-python@v4
+        with:
+          python-version: '3.8'
+
+      - name: Install dependencies
+        run: |
+          python -m pip install --upgrade pip
+          python -m pip install wheel
+      - name: Build
+        run: python setup.py sdist bdist_wheel
+
+      - name: Publish to PyPI
+        uses: pypa/gh-action-pypi-publish@release/v1
+        with:
+          user: '__token__'
+          password: ${{ secrets.PYPI_API_TOKEN }}