Adapt to more scoped config

plays/predeploy/lib/database.yml

@@ -10,27 +10,27 @@
   shell: "
     dokku
     {{ item.type }}:create
-    {{ app }}
+    {{ dokku.app }}
     --password {{ item.passwd }}
     --root-password {{ item.root_passwd }}
   "
   args:
-    creates: "/var/lib/dokku/services/{{ item.type }}/{{ app }}"
+    creates: "/var/lib/dokku/services/{{ item.type }}/{{ dokku.app }}"
   with_items: "{{ db }}"
   when: db is defined
 
 - name: "Link {{ item.type }} database to application"
   dokku_service_link:
-    app: "{{ app }}"
-    name: "{{ app }}"
+    app: "{{ dokku.app }}"
+    name: "{{ dokku.app }}"
     service: "{{ item.type }}"
   with_items: "{{ db }}"
   when: db is defined
 
 - name: "Specify {{ item.type }} volume mounts"
   dokku_storage:
-    app: "{{ app }}"
+    app: "{{ dokku.app }}"
     mounts:
-      - "/var/lib/dokku/services/{{ item.type }}/{{ app }}:{{ mount_map[item.type] }}"
+      - "/var/lib/dokku/services/{{ item.type }}/{{ dokku.app }}:{{ mount_map[item.type] }}"
   with_items: "{{ db }}"
   when: db is defined