Try to use the with_items include syntax correctly again

plays/lib/database.yml

@@ -1,32 +1,31 @@
 ---
 - name: Run database setup tasks
-  when: db is defined
   block:
     - name: Set database facts
       set_fact:
         mount_map:
           mariadb: /var/lib/mysql
 
-    - name: "Create {{ item.type }} database"
+    - name: "Create {{ store.type }} database"
       no_log: true
       shell: "
         dokku
-        {{ item.type }}:create
+        {{ store.type }}:create
         {{ app }}
-        --password {{ item.passwd }}
+        --password {{ store.passwd }}
-        --root-password {{ item.root_passwd }}
+        --root-password {{ store.root_passwd }}
       "
       args:
-        creates: "/var/lib/dokku/services/{{ item.type }}/{{ app }}"
+        creates: "/var/lib/dokku/services/{{ store.type }}/{{ app }}"
 
-    - name: "Link {{ item.type }} database to application"
+    - name: "Link {{ store.type }} database to application"
       dokku_service_link:
         app: "{{ app }}"
         name: "{{ app }}"
-        service: "{{ item.type }}"
+        service: "{{ store.type }}"
 
-    - name: "Specify {{ item.type }} volume mounts"
+    - name: "Specify {{ store.type }} volume mounts"
       dokku_storage:
         app: "{{ app }}"
         mounts:
-          - "/var/lib/dokku/services/{{ item.type }}/{{ app }}:{{ mount_map[item.type] }}"
+          - "/var/lib/dokku/services/{{ store.type }}/{{ app }}:{{ mount_map[store.type] }}"

plays/post_delete.yml

@@ -24,3 +24,4 @@
       args:
         removes: "/var/lib/dokku/services/{{ item.type }}/{{ app }}"
       with_items: "{{ db }}"
+      when: db exists

plays/pre_deploy.yml

@@ -17,12 +17,8 @@
     - name: Include domain tasks
       include: ./lib/domain.yml
 
-    # Note(decentral1se): in order to iterate through the end-user defined `db`
-    # stanza in the config.yml, we need to pass them into the include / block
-    # using `with_items` because Ansible decides that is the only way we can do
-    # that
     - name: Include database tasks
-      include: ./lib/database.yml datastore={{ item }}
+      include: ./lib/database.yml store={{ item }}
       with_items: "{{ db }}"
       when: db is defined