add publish workflow

.github/workflows/publish.yml

@@ -0,0 +1,38 @@
+---
+name: Publish
+
+"on":
+  push:
+    branches:
+      - master
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    strategy:
+      matrix:
+        node-version: [10.x, 12.x, 14.x]
+    steps:
+      - name: Check out code
+        uses: actions/checkout@v2
+
+      - name: Use Node.js ${{ matrix.node-version }}
+        uses: actions/setup-node@v2
+        with:
+          node-version: ${{ matrix.node-version }}
+          registry-url: https://registry.npmjs.org/
+
+      - name: Install
+        run: |
+          npm ci
+      # - name: Lint
+      #   run: |
+      #     npm run lint
+      - name: Test
+        run: |
+          npm test
+      - name: Push release to npm (public)
+        env:
+          NODE_AUTH_TOKEN: ${{secrets.NPM_TOKEN}}
+        run: |
+          npm publish --access public .