Add PyPI publish workflow

Author: Chet Parker

.github/workflows/publish.yml

@@ -0,0 +1,22 @@
+name: Publish to PyPI
+
+on:
+  workflow_dispatch:
+
+jobs:
+  publish:
+    runs-on: ubuntu-latest
+    environment: pypi
+    permissions:
+      id-token: write
+    steps:
+      - uses: actions/checkout@v4
+      - uses: actions/setup-python@v5
+        with:
+          python-version: "3.12"
+      - name: Install build tools
+        run: pip install build
+      - name: Build package
+        run: python -m build
+      - name: Publish to PyPI
+        uses: pypa/gh-action-pypi-publish@release/v1