Add workflow for publishing to PyPI

.github/workflows/publish.yml

@@ -0,0 +1,19 @@
+# From https://www.seanh.cc/2022/05/21/publishing-python-packages-from-github-actions/
+
+name: Publish to PyPI.org
+on:
+  release:
+    types: [published]
+jobs:
+  pypi:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v3
+        with:
+          fetch-depth: 0
+      - run: python3 -m pip install --upgrade build && python3 -m build
+      - name: Publish package
+        uses: pypa/gh-action-pypi-publish@release/v1
+        with:
+          password: ${{ secrets.PYPI_API_TOKEN }}