Where is the mattermost/webrtc documentation?

Hi,

where can I found the documentation to configure https://hub.docker.com/r/mattermost/webrtc/?

I put that in my docker-compose.yml:

webrtc:
  image: mattermost/webrtc
  restart: unless-stopped
  ports:
    - "8188:8188"
    - "8189:8189"
    - "7088:7088"
    - "7089:7089"
    - "5349:5349"

But I don't know where can I found:

• Gateway password
• Turn username
• Turn key

Best regards,
Stéphane