Start ballista ui with docker, but it can not found ballista scheduler

[EricJoy2048]

Describe the bug
Start ballista ui with docker, but it can not found ballista scheduler

To Reproduce
Steps to reproduce the behavior:
I clone the core from master branch. And then use ./dev/build-ballista-docker.sh and ./dev/build-ui.sh finished the docker image build.
I start the image with a docker-compose.yaml , it`s the content:

version: "2.2"
services:
  ballista-scheduler:
    image: ballista:0.6.0
    command: "/scheduler  --bind-host 0.0.0.0 --bind-port 50050"
    ports:
      - "50050:50050"
    environment:
      - RUST_LOG=info
    volumes:
      - ./data1:/data1
  ballista-executor:
    image: ballista:0.6.0
    command: "/executor --bind-host 0.0.0.0 --bind-port 50051 --scheduler-host ballista-scheduler"
    ports:
      - "50051:50051"
    environment:
      - RUST_LOG=info
    volumes:
      - ./data1:/data1
    depends_on:
      - ballista-scheduler

  ballista-scheduler-ui:
    image: ballista-scheduler-ui:0.6.0
    ports:
      - "4000:80"
    environment:
      - RUST_LOG=debug
    volumes:
      - ./data1:/data1
    depends_on:
      - ballista-scheduler

The docker container is start success. But can not find scheduler in the ui.

Expected behavior
A clear and concise description of what you expected to happen.

Additional context
Add any other context about the problem here.

[alamb]

Thanks for the report @gaojun2048 -- @andygrove @edrevo @houqp any thoughts? I don't really have much experience with Ballista so I am not sure what is supposed to happen here