Add pipy publishing workflow.

.github/workflows/publish_pipy.yml

@@ -0,0 +1,24 @@
+name: PyPI
+on:
+  push:
+    tags:
+      - '*'
+
+jobs:
+  build-n-publish:
+    name: Build and publish Python distribution to PyPI
+    runs-on: ubuntu-22.04
+    steps:
+      - uses: actions/checkout@v4
+      - uses: actions/setup-python@v4
+        with:
+          python-version: '3.9'
+      - name: Build a binary wheel and a source tarball
+        run: |
+          python -mpip install build
+          python -m build
+      - name: Publish distribution to PyPI
+        if: startsWith(github.ref, 'refs/tags')
+        uses: pypa/[email protected]
+        with:
+          password: {{ '${{ secrets.PYPI_PASSWORD }}' }}