Err_cert_invalid with websocket and docker-compose

I noticed that yesterday a new version of docker-jisti-meet has been released.
Now it supports websockets.

I’m trying to use this project:

My problem is that I obtain “err_cert_invalid” error when I use my internal installation.the certificate, used in the docker installation, is selfisgned.
can you tell me how I can continue the development with the self signed certificates?