devops: added auto-publishing (#20)

* devops: added auto-publishing

* fix: cleanup

Author: mxschmitt

.github/workflows/npm-publish.yml

@@ -0,0 +1,20 @@
+name: Node.js Package
+on:
+  release:
+    types: [created]
+jobs:
+  publish-npm:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v2
+      - uses: actions/setup-node@v1
+        with:
+          node-version: 12
+          registry-url: https://registry.npmjs.org/
+      - name: Install dependencies
+        run: yarn install --frozen-lockfile
+      - name: Build project
+        run: yarn run build
+      - run: npm publish
+        env:
+          NODE_AUTH_TOKEN: ${{secrets.npm_token}}