add workflow to test on push

Author: g-harel

.github/workflows/push.yml

@@ -0,0 +1,12 @@
+on: push
+jobs:
+  test:
+    runs-on: ubuntu-latest
+    steps:
+    - uses: actions/checkout@v2
+    - uses: actions/setup-node@v1
+      with:
+        node-version: '12.x'
+    - run: yarn
+    - run: yarn run build
+    - run: yarn run test