Add automated PyPI release workflow

.github/workflows/release.yml

@@ -0,0 +1,56 @@
+# Upload a Python Package using Twine when a release is created
+
+name: Build
+on:
+  release:
+    types: [published]
+  push:
+    branches:
+      - main
+  pull_request:
+    branches:
+      - main
+
+permissions:
+  contents: read
+
+jobs:
+  package:
+    runs-on: ubuntu-latest
+    steps:
+    - uses: actions/checkout@v3
+    - name: Set up Python
+      uses: actions/setup-python@v4
+      with:
+        python-version: '3.11'
+    - name: Install dependencies
+      run: |
+        python -m pip install --upgrade pip
+        pip install build twine
+    - name: Build package
+      run: python -m build --sdist --wheel
+    - name: Check package
+      run: twine check --strict dist/*
+    - name: Check env vars
+      run: |
+        echo "Triggered by: ${{ github.event_name }}"
+    - uses: actions/upload-artifact@v3
+      with:
+        name: dist
+        path: dist
+
+  # PyPI on release
+  pypi:
+    needs: package
+    runs-on: ubuntu-latest
+    if: github.event_name == 'release'
+    steps:
+    - uses: actions/download-artifact@v3
+      with:
+        name: dist
+        path: dist
+    - name: Publish to PyPI
+      uses: pypa/gh-action-pypi-publish@release/v1
+      with:
+        user: __token__
+        password: ${{ secrets.PYPI_API_TOKEN }}