ci: add github action to publish to npm

.github/workflows/npm-publish.yml

@@ -0,0 +1,19 @@
+name: Publish package on new release
+on:
+  push:
+    branches:
+      - 'main'
+jobs:
+  publish:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v2
+      - name: Setup Node.js environment
+        uses: actions/setup-node@v2
+        with:
+          node-version: "18.x"
+          registry-url: "https://registry.npmjs.org"
+      - name: Publish package
+        run: npm publish
+        env:
+          NODE_AUTH_TOKEN: ${{ secrets.NPM_AUTH_TOKEN }}