ci: add npm publish workflow on release

Author: Sam Painter

.github/workflows/publish.yml

@@ -0,0 +1,22 @@
+name: Publish
+
+on:
+  release:
+    types: [published]
+
+jobs:
+  publish:
+    runs-on: ubuntu-latest
+    environment: npm
+    permissions:
+      contents: read
+      id-token: write
+    steps:
+      - uses: actions/checkout@v4
+      - uses: actions/setup-node@v4
+        with:
+          node-version: 24
+          cache: npm
+          registry-url: https://registry.npmjs.org
+      - run: npm ci
+      - run: npm publish --provenance --access public