Joomla: Add LDAP autocreate plugin support

- Introduced autocreate_users feature flag in config/main.yml
- Added ldapautocreate.php and ldapautocreate.xml plugin files
- Implemented tasks/01_ldap_files.yml for plugin deployment
- Added tasks/05_ldap.yml to configure LDAP plugin and register ldapautocreate
- Renamed tasks for better structure (01→02, 02→03, etc.)
- Updated cli-ldap.php.j2 for clean parameter handling
- Mounted ldapautocreate plugin via docker-compose.yml.j2
- Extended vars/main.yml with LDAP autocreate configuration

Ref: https://chatgpt.com/share/68b0802f-bfd4-800f-b10a-57cf0c091f7e

roles/web-app-joomla/config/main.yml

@@ -1,3 +1,4 @@
+autocreate_users:     true # Autocreate LDAP users on Login
 features:
   matomo:             true
   css:                true
@@ -24,4 +25,4 @@ docker:
       version:  latest
       name:     joomla
   volumes:
-    data:             "joomla_data"
+    data:       "joomla_data"