wait until database and broker are ready before starting backend

backend @ 56c50026

-Subproject commit da9279c2a18e711ddfaf5206fc296f50ab87079c
+Subproject commit 56c50026bf51b174d527a5258b92ac7b96fc152b

docker-compose.yml

@@ -26,10 +26,16 @@ services:
       LOG_LEVEL: info
       LOG_FILE: villasweb-backend_log.txt
       DEFAULT_ADMIN: "true"
+    command: [
+      "wait-for", "broker:5672", "--",
+      "wait-for", "database:27017", "--",
+      "npm", "start"
+    ]
     volumes:
       - files:/usr/src/app/public/
     depends_on:
       - broker
+      - database
     restart: always
 
   # A single reverse proxy for all our services