devops: add publish to NPM workflow (#7)

Author: mxschmitt

.github/workflows/publish.yml

@@ -0,0 +1,17 @@
+name: Publish NPM
+on:
+  release:
+    types: [published]
+jobs:
+  publish-npm:
+    runs-on: ubuntu-20.04
+    steps:
+      - uses: actions/checkout@v2
+      - uses: actions/setup-node@v2
+        with:
+          node-version: 16
+          registry-url: https://registry.npmjs.org/
+      - run: npm ci
+      - run: npm publish
+        env:
+          NODE_AUTH_TOKEN: ${{secrets.NPM_TOKEN}}