Jitsi XMPP Websocket support

Jitsi-meet enabled websockets by default, claiming better reliability.
Matrix-nginx-proxy configuration has been set up according to the
Prosody documentation: https://prosody.im/doc/websocket

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

@@ -3,6 +3,8 @@ AUTH_TYPE={{ matrix_jitsi_auth_type }}
 ENABLE_AUTH={{ 1 if matrix_jitsi_enable_auth else 0 }}
 ENABLE_GUESTS={{ 1 if matrix_jitsi_enable_guests else 0 }}
 
+PUBLIC_URL={{ matrix_jitsi_web_public_url }}
+
 LDAP_URL={{ matrix_jitsi_ldap_url }}
 LDAP_BASE={{ matrix_jitsi_ldap_base }}
 LDAP_BINDDN={{ matrix_jitsi_ldap_binddn }}

roles/matrix-nginx-proxy/templates/nginx/conf.d/matrix-jitsi.conf.j2

@@ -49,6 +49,27 @@
 
 		tcp_nodelay on;
 	}
+
+	# XMPP websocket
+	location = /xmpp-websocket {
+		{% if matrix_nginx_proxy_enabled %}
+			resolver 127.0.0.11 valid=5s;
+			set $backend {{ matrix_jitsi_xmpp_bosh_url_base }};
+			proxy_pass $backend/xmpp-websocket;
+		{% else %}
+			{# Generic configuration for use outside of our container setup #}
+			proxy_pass http://127.0.0.1:5280;
+		{% endif %}
+		proxy_set_header Host $host;
+
+		proxy_http_version 1.1;
+		proxy_read_timeout 900s;
+		proxy_set_header Connection "upgrade";
+		proxy_set_header Upgrade $http_upgrade;
+		proxy_set_header X-Forwarded-For $remote_addr;
+		proxy_set_header X-Forwarded-Proto $scheme;
+		tcp_nodelay on;
+	}
 {% endmacro %}
 
 server {