Fiddle with database vars wiring

plays/lib/database.yml

@@ -3,9 +3,8 @@
 - name: Run database setup tasks
   when: db is defined
   block:
-    - name: Setup preparatory facts
+    - name: Setup database facts
       set_fact:
-        db_type: "{{ db.type }}"
         mount_map:
           mariadb: /var/lib/mysql
 

plays/lib/prepare.yml

@@ -4,6 +4,6 @@
 # already (due to the order of the tasks we define for our deployment steps)
 - name: Export variable placeholders
   set_fact:
-    dokku_db_addr: ""
-    dokku_db_user: ""
+    dokku_mariadb_db_addr: "dokku-mariadb-{{ app }}"
+    dokku_mariadb_db_user: "mariadb"
     dokku_hostname: "{{ lookup('file', '/home/dokku/HOSTNAME') }}"