Local js plugin deployment cannot serve static asset

[david90]

(Describe the issue here)

• Skygear SDK Date/Version: skygear-node
• JS runtime:
• Skygear Server Date/Version: 1.5.0
• Is this a regression?
• Attached logs, screenshots

Expected Results

1. localhost:3000/static should be automatically serving public_html
2. skygearCloud.staticAsset should be able to serve a designated folder

Actual Results

1. localhost:3000/static is blank
2. skygearCloud.staticAsset is {"result":{"status":"OK"}}

Steps to reproduce

env

PLUGINS="JSJS"
JSJS_TRANSPORT="http"
JSJS_PATH="http://localhost:9000"

PUBSUB_URL="ws://localhost:3000/pubsub"
SKYGEAR_ENDPOINT="http://localhost:3000"
HTTP=true
SERVE_STATIC_ASSETS=true

staticAsset according to docs

  skygearCloud.staticAsset('/myfolder', function() {
      return __dirname + '/myfolder/';
  });