Add PyPI publishing workflow

This workflow is identical to the one used by beman-tidy.

Author: ednolan

.github/workflows/publish.yml

@@ -0,0 +1,47 @@
+# SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+
+name: Build and Publish
+
+on:
+  release:
+    types:
+      - published
+
+jobs:
+  build:
+    name: Build Distributions
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v5
+
+      - name: Install uv
+        uses: astral-sh/setup-uv@v6
+        with:
+          enable-cache: true
+
+      - name: uv build
+        run: uv build
+
+      - name: Upload artifacts
+        uses: actions/upload-artifact@v4
+        with:
+          name: dists
+          path: dist/
+
+  publish:
+    name: Publish to PyPI
+    needs: build
+    runs-on: ubuntu-latest
+    environment: pypi
+    permissions:
+      id-token: write
+    steps:
+      - name: Fetch artifacts
+        uses: actions/download-artifact@v4
+        with:
+          name: dists
+          path: dist/
+
+      - name: Publish to PyPI
+        uses: pypa/gh-action-pypi-publish@release/v1