Updates prosody config for main muc component.

debian/jitsi-meet-prosody.postinst

             PROSODY_CONFIG_PRESENT="false"
         fi
 
+        # Updates main muc component
+        MAIN_MUC_PATTERN="Component \"conference.$JVB_HOSTNAME\" \"muc\""
+        if ! grep -A 2 -- "${MAIN_MUC_PATTERN}" $PROSODY_HOST_CONFIG | grep -q "restrict_room_creation" ;then
+            sed -i "s/${MAIN_MUC_PATTERN}/${MAIN_MUC_PATTERN}\n    restrict_room_creation = true/g" $PROSODY_HOST_CONFIG
+        fi
+
         # Make sure the focus@auth user's roster includes the proxy component (this is idempotent)
         prosodyctl mod_roster_command subscribe focus.$JVB_HOSTNAME $JICOFO_AUTH_USER@auth.$JVB_HOSTNAME
 

doc/debian/jitsi-meet-prosody/prosody.cfg.lua-jvb.example

     -- muc_lobby_whitelist = { "recorder.jitmeet.example.com" } -- Here we can whitelist jibri to enter lobby enabled rooms
 
 Component "conference.jitmeet.example.com" "muc"
+    restrict_room_creation = true
     storage = "memory"
     modules_enabled = {
         "muc_meeting_id";