add publish workflow

.github/workflows/publish.yaml

@@ -0,0 +1,40 @@
+name: Publish
+on:
+  push:
+    tags: ['*']
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+      - uses: actions/setup-python@v5
+        with:
+          python-version: '3.x'
+      - name: Check tag matches package version
+        run: |
+          version=$(python -c "import tomllib; print(tomllib.load(open('pyproject.toml', 'rb'))['project']['version'])")
+          if [ "$version" != "$GITHUB_REF_NAME" ]; then
+            echo "Tag $GITHUB_REF_NAME does not match pyproject.toml version $version"
+            exit 1
+          fi
+      - name: Build
+        run: |
+          pip install build twine
+          python -m build
+          twine check dist/*
+      - uses: actions/upload-artifact@v4
+        with:
+          name: dist
+          path: dist/
+  publish:
+    needs: build
+    runs-on: ubuntu-latest
+    environment: pypi
+    permissions:
+      id-token: write
+    steps:
+      - uses: actions/download-artifact@v4
+        with:
+          name: dist
+          path: dist/
+      - uses: pypa/gh-action-pypi-publish@release/v1