github: automatically publish to PyPI

See rpm-software-management#23

.github/workflows/pypi-publish.yml

@@ -0,0 +1,35 @@
+# Upload a Python package when a release is created
+# https://packaging.python.org/guides/publishing-package-distribution-releases-using-github-actions-ci-cd-workflows
+
+name: Publish Python 🐍 distributions 📦 to PyPI
+
+on:
+  release:
+    types: [released]
+
+jobs:
+  build-n-publish:
+    runs-on: ubuntu-latest
+    permissions:
+      id-token: write # for trusted publishing
+
+    steps:
+      - uses: actions/checkout@v3
+      - uses: actions/setup-python@v4
+
+      - name: Get history and tags for SCM versioning to work
+        run: |
+          git fetch --prune --unshallow
+          git fetch --depth=1 origin +refs/tags/*:refs/tags/*
+
+      - name: Build a source tarball and a binary wheel
+        # https://pypa-build.readthedocs.io
+        run: |
+          python -m pip install build
+          python -m build
+
+      - name: Publish 📦 to PyPI
+        # https://github.com/pypa/gh-action-pypi-publish
+        uses: pypa/gh-action-pypi-publish@release/v1
+        with:
+          verbose: true