Re-add depends_on

compose.yml

@@ -5,10 +5,12 @@ services:
   app:
     image: farmos/farmos:2.0.0-beta7
     volumes:
-      - farmos_sites:/opt/drupal/web/sites
+      - farmos_sites:/opt/drupal/
     networks:
       - proxy
       - internal
+    depends_on:
+      - db
     deploy:
       restart_policy:
         condition: on-failure
@@ -36,8 +38,6 @@ services:
       - internal
     volumes:
       - postgres_data:/var/lib/postgresql/data
-    ports:
-      - '5432:5432'
     environment:
       POSTGRES_USER: farm
       POSTGRES_PASSWORD: farm