Add automatic builds with GitHub Actions

.github/workflows/build-on-push.yml

@@ -0,0 +1,20 @@
+name: Build and test application on push to remote
+
+on: [push]
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v1
+      - uses: actions/setup-node@v1
+        with:
+          node-version: 12
+      - run: yarn install
+      - run: yarn build
+      - run: yarn test
+
+      - name: Commit changes
+        uses: dom111/actions-js-build/commit@master
+        env:
+          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}