Testing the TURN server

[circuitry2]

I am trying to verify that the TURN server is working using this site:
https://webrtc.github.io/samples/src/content/peerconnection/trickle-ice/

It is my understanding that TURN requires a username and password. Is there a default username and password set in this image?

[icedream]

Since this is a fork of bprodoehl/docker-turnserver I quickly took a look and found this issue where the suggestion was raised that custom credentials would need to be fed in by means impossible without changes to the image itself.

I myself don't use this image currently so I have no idea how (if at all) and with which default credentials it was supposed to work.