borgbackup#2 Fix mysql backup in apps and update alerta command

templates/maven/docker-compose.yml

@@ -55,7 +55,7 @@ services:
 {% if alerta_project_id is defined %}
       - ALERTA_PROJECT_ID={{ alerta_project_id }}
 {% endif %}
-{% if alerta_project_id is defined %}
+{% if alerta_proxy_port is defined %}
       - PORT={{ alerta_proxy_port }}
 {% endif %}
 {% endif %}