Add workflow for npm publish

Author: lukehorvat

.github/workflows/publish.yml

@@ -0,0 +1,20 @@
+# This workflow publishes the package to npm when a release is created.
+
+name: Publish
+on:
+  release:
+    types: [created]
+jobs:
+  publish:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v3
+      - uses: actions/setup-node@v3
+        with:
+          node-version: 18
+          registry-url: https://registry.npmjs.org/
+      - run: npm ci
+      - run: npm run build --if-present
+      - run: npm publish
+        env:
+          NODE_AUTH_TOKEN: ${{secrets.NPM_TOKEN}}