Expand default vars to take care of mongodb

plays/commonlib/vars.yml

@@ -46,8 +46,16 @@
     dokku:
       {
         app: "{{ app }}",
+
         mariadb_addr: "dokku-mariadb-{{ app }}",
+        mongodb_addr: "dokku-mongo-{{ app }}:27017",
+
         mariadb_user: "mariadb",
+        mongodb_user: "{{ app }}",
+
+        mariadb_type: "mariadb",
+        mongodb_type: "mongodb",
+
         hostname: "{{ lookup('file', '/home/dokku/HOSTNAME') }}",
         host: "{{ inventory_hostname }}",
       }