Parse Dashboard not connecting Parse Server (err: master key is required)

New Issue Checklist

• I am not disclosing a vulnerability.
• I am not just asking a question.
• I have searched through existing issues.
• I can reproduce the issue with the latest versions of Parse Server and Parse Dashboard.

Issue Description

Parse Dashboard not connecting Parse Server (err: master key is required)

Steps to reproduce

docker run --name parse-mongo-db -e MONGO_INITDB_ROOT_USERNAME=admin -e MONGO_INITDB_ROOT_PASSWORD=password -p 27017:27017 -d mongo

docker run --name parse-server -e PARSE_SERVER_APPLICATION_ID=myapp -e PARSE_SERVER_MASTER_KEY=master_key -e PARSE_SERVER_DATABASE_URI=mongodb://admin:password@mongo/parse_server?authSource=admin --link parse-mongo-db:mongo -p 1337:1337 -d parseplatform/parse-server

cat > /tmp/config.json << EOF
{
  "apps": [
    {
      "serverURL": "http://localhost:1337/parse",
      "appId": "myapp",
      "masterKey": "master_key",
      "appName": "myapp",
      "masterKeyIps": ["127.0.0.1"]
    }
  ],
  "users": [
    {
      "user":"admin",
      "pass":"password",
      "apps": [{"appId": "myapp", "readOnly": false}]
    }
  ]
}
EOF

docker run --name parse-dashboard -e PARSE_DASHBOARD_ALLOW_INSECURE_HTTP=true --link parse-server:parse-server -p 4040:4040 -v /tmp/config.json:/src/Parse-Dashboard/parse-dashboard-config.json -d parseplatform/parse-dashboard

Actual Outcome

Expected Outcome

Successful Login

Environment

$ docker images
parseplatform/parse-server      latest       7c5539478f9a   6 days ago     262MB
parseplatform/parse-dashboard   latest       ba8bd5083493   3 months ago   361MB
mongo                           latest       a440572ac3c1   3 days ago     639MB

Dashboard

• Parse Dashboard version: ba8bd5083493
• Browser (Safari, Chrome, Firefox, Edge, etc.): All
• Browser version: NA

Server

• Parse Server version: 7c5539478f9a
• Operating system: MacOS
• Local or remote host (AWS, Azure, Google Cloud, Heroku, Digital Ocean, etc): Local

Database

• System (MongoDB or Postgres): Mongo
• Database version: a440572ac3c1
• Local or remote host (MongoDB Atlas, mLab, AWS, Azure, Google Cloud, etc): Local

Logs

Failed to load resource: the server responded with a status of 403 (Forbidden)

on browser ^

Reproduce the Docker setup using the supplied Parse Server, MongoDB, Dashboard, and parse-dashboard-config.json settings, then inspect the browser's 403 response. Check the serverURL, appId, masterKey, and Dashboard login configuration; done means the Dashboard connects and login succeeds without the master-key error.