update build command

Author: chunyenHuang

amplify.yml

@@ -0,0 +1,22 @@
+version: 1
+backend:
+  phases:
+    preBuild:
+      commands:
+        - npm i
+    build:
+      commands:
+        - '# Execute Amplify CLI with the helper script'
+        - amplifyPush --simple
+frontend:
+  phases:
+    build:
+      commands:
+        - npm run build
+  artifacts:
+    baseDirectory: build
+    files:
+      - '**/*'
+  cache:
+    paths:
+      - node_modules/**/*