Add workflow to publish releases to PyPI

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

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+name: Publish release to PyPI
+
+on:
+  workflow_dispatch:
+  release:
+    types: [published]
+
+jobs:
+  build-and-upload:
+    runs-on: ubuntu-latest
+
+    steps:
+    - name: Check out the release commit
+      uses: actions/checkout@v3
+    - name: Set up Python
+      uses: actions/setup-python@v4
+      with:
+        python-version: '3.10'
+    - name: Install Python packages needed for build and upload
+      run: |
+        python -m pip install --upgrade pip
+        python -m pip install build twine
+    - name: Build sdist and wheel
+      run: |
+        python -m build
+    - name: Publish to PyPI
+      env:
+        TWINE_USERNAME: ${{ secrets.PYPI_USERNAME }}
+        TWINE_PASSWORD: ${{ secrets.PYPI_PASSWORD }}
+      run: |
+        python -m twine check --strict dist/*
+        python -m twine upload dist/*

docs/releases/upcoming/315.build.rst

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+Add GitHub Actions workflow for automatically publishing releases to PyPI. (#315)