Add script to publish to npm on tagged releases.

Author: Shaptic

.github/workflows/npm-publish.yml

@@ -0,0 +1,28 @@
+name: npm publish
+on:
+  release:
+    types: [published]
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v3
+
+      - name: Install Node
+        uses: actions/setup-node@v3
+        with:
+          node-version: '14.x'
+          registry-url: 'https://registry.npmjs.org'
+
+      - name: Install Dependencies
+        run: yarn
+
+      - name: Build & Test
+        run: yarn build && yarn test
+
+      - name: Publish npm package
+        run: yarn publish
+        env:
+          NODE_AUTH_TOKEN: ${{ secrets.NPM_TOKEN }}