feat: Add npm release action

.github/workflows/npm.yml

@@ -0,0 +1,22 @@
+name: Release to npm
+
+on:
+  release:
+    types: [published]
+
+jobs:
+  release:
+    runs-on: ubuntu-18.04
+    steps:
+      - uses: actions/checkout@v2
+      - uses: actions/setup-node@v2-beta
+        with:
+          node-version: '14'
+      - name: Install npm dependencies
+        run: npm install
+      - name: Create build
+        run: npm run build
+      - name: Authenticate with the npm registry
+        run: echo "//registry.npmjs.org/:_authToken=${{ secrets.NPM_TOKEN }}" >> ~/.npmrc
+      - name: Release to npm
+        run: npm publish