Add PyPI release workflow

.github/workflows/release.yml

@@ -0,0 +1,39 @@
+name: release
+
+on:
+  push:
+    tags:
+      - "[0-9]+.[0-9]+.[0-9]+"
+  pull_request:
+    branches:
+      - master
+
+permissions:
+  contents: read
+
+jobs:
+  release:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v6
+
+      - name: Set up Python
+        uses: actions/setup-python@v6
+        with:
+          python-version: "3.10"
+
+      - name: Install build dependencies
+        run: |
+          python -m pip install --upgrade pip
+          python -m pip install build
+
+      - name: Build package
+        run: python -m build --sdist --wheel
+
+      - name: Publish to PyPI
+        if: github.event_name != 'pull_request'
+        uses: pypa/gh-action-pypi-publish@v1.13.0
+        with:
+          user: __token__
+          password: ${{ secrets.PYPI_API_TOKEN }}
+          skip_existing: true