Fixed not being able to start a jitsi conference in webinterface

I am accessing my jitsi domain via webbrowser and in the preview screen everything seems fine, but when I click "join conference" nothing happens. After a few seconds I get an error saying "your connection was terminated. A new attempt will be started in 30 seconds".

Fix
https://community.jitsi.org/t/jitsi-meet-in-docker-container-websocket-error/88703/15

roles/matrix-jitsi/templates/web/env.j2

@@ -56,7 +56,7 @@ ENABLE_SUBDOMAINS
 ENABLE_TALK_WHILE_MUTED
 ENABLE_TCC
 ENABLE_TRANSCRIPTIONS={{ 1 if matrix_jitsi_enable_transcriptions else 0 }}
-ENABLE_XMPP_WEBSOCKET
+ENABLE_XMPP_WEBSOCKET=0
 ETHERPAD_PUBLIC_URL
 ETHERPAD_URL_BASE={{ (matrix_jitsi_etherpad_base + '/') if matrix_jitsi_etherpad_enabled else ''}}
 GOOGLE_ANALYTICS_ID