Add publish workflow (#8)

.github/workflows/publish.yaml

@@ -0,0 +1,31 @@
+name: Publish
+
+on:
+  push:
+    tags:
+      - 'v*.*.*'
+  workflow_dispatch:
+
+env:
+  node_version: 22
+
+permissions:
+  id-token: write
+
+jobs:
+  publish:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+
+      - uses: actions/setup-node@v4
+        with:
+          node-version: ${{ env.node_version }}
+          registry-url: 'https://registry.npmjs.org'
+
+      - run: npm ci
+
+      - run: npm publish --provenance --access public
+        if: startsWith(github.ref, 'refs/tags/')
+        env:
+          NODE_AUTH_TOKEN: ${{ secrets.NPM_TOKEN }}