Solved variable bugs

roles/docker-mariadb/tasks/main.yml

@@ -59,7 +59,7 @@
 
 - name: "Create database user: {{ database_username }}"
   mysql_user:
-    name: "{{database_username}}"
+    name:     "{{database_username}}"
     password: "{{database_password}}"
     host: "%"
     priv: '{{database_name}}.*:ALL'

roles/docker-mariadb/vars/configuration.yml

@@ -0,0 +1,2 @@
+version:  "latest"
+hostname: "central-mariadb"

roles/docker-mariadb/vars/main.yml

@@ -1,3 +1 @@
-version:        "latest"
-application_id: "mariadb"
-hostname:       "central-{{application_id}}"
+application_id: "mariadb"