fix playback url not using env.Domain

mod/core/Dockerfile

@@ -57,7 +57,7 @@ COPY red5-webapps/screenshare/application.conf /usr/share/red5/webapps/screensha
 COPY red5-webapps/video/bigbluebutton-video.properties /usr/share/red5/webapps/video/WEB-INF/bigbluebutton-video.properties
 COPY red5-webapps/video-broadcast/video-broadcast.properties /usr/share/red5/webapps/video-broadcast/WEB-INF/video-broadcast.properties
 
-COPY bigbluebutton.yml /usr/local/bigbluebutton/core/scripts/bigbluebutton.yml
+COPY bigbluebutton.yml /usr/local/bigbluebutton/core/scripts/bigbluebutton.yml.tmpl
 
 COPY web/bigbluebutton.properties /usr/share/bbb-web/WEB-INF/classes/bigbluebutton.properties.tmpl
 COPY web/turn-stun-servers.xml /usr/share/bbb-web/WEB-INF/classes/spring/turn-stun-servers.xml.tmpl

mod/core/bigbluebutton.yml

@@ -25,7 +25,7 @@ events_dir: /var/bigbluebutton/events
 recording_dir: /var/bigbluebutton/recording
 published_dir: /var/bigbluebutton/published
 captions_dir: /var/bigbluebutton/captions
-playback_host: meet.livingutopia.org
+playback_host: {{ .Env.DOMAIN }}
 playback_protocol: https
 
 # For DEVELOPMENT

mod/core/entrypoint.sh

@@ -22,6 +22,7 @@ cp -r /usr/src/bbb-src-playback/* /var/bigbluebutton/playback
 chown -R bigbluebutton:bigbluebutton /var/bigbluebutton
 
 dockerize \
+    -template /usr/local/bigbluebutton/core/scripts/bigbluebutton.yml.tmpl:/usr/local/bigbluebutton/core/scripts/bigbluebutton.yml \
     -template /usr/share/bbb-web/WEB-INF/classes/bigbluebutton.properties.tmpl:/usr/share/bbb-web/WEB-INF/classes/bigbluebutton.properties \
     -template /usr/share/bbb-apps-akka/conf/application.conf.tmpl:/usr/share/bbb-apps-akka/conf/application.conf \
     -template /usr/share/bbb-web/WEB-INF/classes/spring/turn-stun-servers.xml.tmpl:/usr/share/bbb-web/WEB-INF/classes/spring/turn-stun-servers.xml \