Add release workflow

.github/workflows/release.yml

@@ -0,0 +1,35 @@
+name: release
+
+permissions:
+  contents: read
+  id-token: write
+
+on:
+  release:
+    types: [published]
+
+jobs:
+  publish:
+    runs-on: ubuntu-latest
+
+    environment:
+      name: production
+      url: https://www.npmjs.com/package/generator-license
+
+    steps:
+      - name: checkout
+        uses: actions/checkout@v4
+
+      - name: setup node
+        uses: actions/setup-node@v4
+        with:
+          node-version: '20'
+          registry-url: 'https://registry.npmjs.org'
+
+      - name: npm ci
+        run: npm ci
+
+      - name: npm publish
+        run: npm publish --provenance --access public
+        env:
+          NODE_AUTH_TOKEN: ${{ secrets.NODE_AUTH_TOKEN }}