install 7z for docker build

'download

fix docker build changing submodule detection

Update config.yml

Merge branch 'master' of https://github.com/mpromonet/webrtc-streamer

Update README.md

Update Dockerfile

add -a and more rtsp url

try to disable downalod of chromium-webrtc-resources

allow to use JanusVideoRoom with nodejs

rollback multiple line doesnot works like this