🔧 Add npm publish workflow

.github/workflow/npm-publish.yaml

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+name: NPM publish CD workflow
+
+name: npm-publish
+on:
+  push:
+    tags:
+    - '*'
+
+jobs:
+  npm-publish:
+    # Run on latest version of ubuntu
+    runs-on: ubuntu-latest
+    steps:
+    - name: Checkout repository
+      uses: actions/checkout@v2
+    # install Node.js
+    - name: Use Node.js 12
+      uses: actions/setup-node@v1
+      with:
+        node-version: 12
+        # Specifies the registry, this field is required!
+        registry-url: https://registry.npmjs.org/
+    - run: npm install -g yarn
+    # clean install of your projects' deps. We use "npm ci" to avoid package lock changes
+    - run: yarn install
+    # build the project
+    - run: yarn run build
+    # run tests just in case
+    - run: yarn run test
+    # publish to NPM -> there is one caveat, continue reading for the fix
+    - run: npm publish
+      env:
+        # Use a token to publish to NPM. See below for how to set it up
+        NODE_AUTH_TOKEN: ${{ secrets.NPM_TOKEN }}