web-app-mediawiki: template-driven LocalSettings.php + admin automation; compose & config tweaks

Config & features:
- roles/web-app-mediawiki/config/main.yml:
  - Add sitename ('Wiki on {{ PRIMARY_DOMAIN | upper }}') and meta_namespace ('Meta')
  - Enable central_database feature and database service
  - Move volumes under docker.volumes (correct indentation)

Tasks & automation:
- roles/web-app-mediawiki/tasks/main.yml:
  - Avoid immediate compose handler flush (docker_compose_flush_handlers: false), then explicit meta: flush_handlers
  - Deploy templated LocalSettings.php to host path
  - Create admin via maintenance/createAndPromote.php (docker exec, idempotent changed_when/failed_when)

Templates:
- roles/web-app-mediawiki/templates/LocalSettings.php.j2:
  - Set $wgSitename, $wgMetaNamespace, $wgServer from MEDIAWIKI_*
  - DB settings (mysql, host:port, name, user, password)
  - Mail settings (EmergencyContact/PasswordSender)
  - Default skin: vector
  - Load basic extensions (ParserFunctions, Cite)
- roles/web-app-mediawiki/templates/docker-compose.yml.j2:
  - Switch to MEDIAWIKI_* vars, mount LocalSettings.php (ro)
  - Use container_port, include curl healthcheck
  - Fix volumes name to MEDIAWIKI_VOLUME

Vars:
- roles/web-app-mediawiki/vars/main.yml:
  - Restructure with MEDIAWIKI_* (sitename, meta_namespace, URL, image/version/container/volume)
  - Define SETTINGS host/dock paths, container_port, default user (www-data)
  - Admin bootstrap vars (name/password/email)

Misc:
- Add empty schema/main.yml placeholder for future validation

Refs: ChatGPT conversation (2025-08-28, Europe/Berlin). Link: https://chatgpt.com/share/68b0ace6-f8f4-800f-b7a7-a51a6c5260f1

roles/web-app-mediawiki/tasks/main.yml

@@ -2,7 +2,32 @@
 - name: "load docker, db and proxy for {{ application_id }}"
   include_role: 
     name: cmp-db-docker-proxy
+  vars:
+    docker_compose_flush_handlers: false
 
-- name: add docker-compose.yml
-  template: src=docker-compose.yml.j2 dest={{ docker_compose.directories.instance }}docker-compose.yml
-  notify: docker compose up
+- name: "Deploy MediaWiki LocalSettings.php"
+  template:
+    src: "LocalSettings.php.j2"
+    dest: "{{ MEDIAWIKI_SETTINGS_HOST_PATH }}"
+    mode: '0644'
+
+- name: "Flush docker compose handlers"
+  meta: flush_handlers
+
+- name: "Create MediaWiki admin user"
+  command: >
+    docker exec
+    -u {{ MEDIAWIKI_USER }}
+    {{ MEDIAWIKI_CONTAINER }}
+    php /var/www/html/maintenance/createAndPromote.php
+    --bureaucrat --sysop
+    {{ MEDIAWIKI_ADMINISTRATOR_NAME }}
+    {{ MEDIAWIKI_ADMINISTRATOR_PASSWORD }}
+    {{ MEDIAWIKI_ADMINISTRATOR_EMAIL }}
+  register: create_admin
+  changed_when: >
+    'created' in (create_admin.stdout | default('')) or
+    'Created' in (create_admin.stdout | default(''))
+  failed_when: >
+    create_admin.rc != 0 and
+    ('already exists' not in (create_admin.stdout | default('') ~ create_admin.stderr | default('')))