File server does not start

Hi, i'm using this docker image with docker-compose:
```
version: '3'

services:
redis:
container_name: redis
hostname: redis
image: redis
ports:
- "6379:6379"

nucleus:
image: atlassian/nucleus
depends_on:
- redis
volumes:
- './config.js:/opt/service/config.js'
- './files:/opt/service/.files'
- './db:/opt/service/db'
ports:
- 8888:8888
- 9999:9999
environment:
- DEBUG=nucleus* `
```
in my config.js i have:
```
const path = require('path');

module.exports = {
port: 8888,
baseURL: 'http://192.168.0.203:8888',
dbStrategy: 'sequelize',
sequelize: {
dialect: 'sqlite',
storage: path.resolve(__dirname, 'db', 'db.sqlite'),
},
fileStrategy: 'local',
local: {
root: path.resolve(__dirname, '.files'),
staticUrl: 'http://192.168.0.203:9999'
},
authStrategy: 'local',
localAuth: [{
displayName: 'Administrator',
username: 'admin',
password: '*hidden*',
photo: 'https://pbs.twimg.com/profile_images/1219364727/charlie-support_400x400.png'
}],
adminIdentifiers: ['admin'],
sessionConfig: {
type: "redis",
secret: 'ThisIsNotSecret',

redis: {
host: 'redis',
port: '6379'
}
},
organization: 'org',
gpgSigningKey: `*hidden*`,
defaultRollout: 0
};
```
where 192.168.0.203 is the ip of the machine

everithing works except the file server. On port 9999 nothing is running.

Thanks

Start with the supplied docker-compose configuration and config.js, then reproduce the setup and inspect the application logs while checking port 9999. Done means the file server starts in the nucleus container and port 9999 responds for the configured local files.

Written by the indexing model from the issue text.