Add support for enabling Jitsi lobby

Related to #643 (Github Issue)

roles/matrix-jitsi/defaults/main.yml

@@ -49,6 +49,8 @@ matrix_jitsi_jibri_xmpp_password: ''
 matrix_jitsi_jibri_recorder_user: recorder
 matrix_jitsi_jibri_recorder_password: ''
 
+matrix_jitsi_enable_lobby: false
+
 matrix_jitsi_container_image_tag: "stable-4857"
 
 matrix_jitsi_web_docker_image: "jitsi/web:{{ matrix_jitsi_container_image_tag }}"

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

@@ -42,4 +42,6 @@ JIBRI_XMPP_PASSWORD={{ matrix_jitsi_jibri_xmpp_password }}
 JIBRI_RECORDER_USER={{ matrix_jitsi_jibri_recorder_user }}
 JIBRI_RECORDER_PASSWORD={{ matrix_jitsi_jibri_recorder_password }}
 
+ENABLE_LOBBY={{ 1 if matrix_jitsi_enable_lobby else 0 }}
+
 TZ={{ matrix_jitsi_timezone }}