feat(web-app-joomla): reliable first-run install, safe debug toggler, DB patching, LDAP scaffolding

Why
- Fix flaky first-run installs and make config edits idempotent.
- Prepare LDAP support and allow optional inline CSP for UI.
- Improve observability and guard against broken configuration.php.

What
- config/main.yml: enable features.ldap; add CSP flags (allow inline style/script elem); minor spacing.
- tasks/: split into 01_install (wait for core, absolute CLI path), 02_debug (toggle $debug/$error_reporting safely), 03_patch (patch DB creds in configuration.php), 04_ldap (configure plugin via helper), 05_assert (optional php -l).
- templates/Dockerfile.j2: conditionally install/compile php-ldap (fallback to docker-php-ext-install with libsasl2-dev).
- templates/cli-ldap.php.j2: idempotently enable & configure Authentication - LDAP from env.
- templates/docker-compose.yml.j2: build custom image when LDAP is enabled; mount cli-ldap.php; pull_policy: never.
- templates/env.j2: add site/admin vars, MariaDB connector/env, full LDAP env.
- vars/main.yml: default to MariaDB (mysqli), add JOOMLA_* vars incl. JOOMLA_CONFIG_FILE.

Notes
- LDAP path implemented but NOT yet tested end-to-end.
- Ref: https://chatgpt.com/share/68b068a8-2aa4-800f-8cd1-56383561a9a8.

roles/web-app-joomla/templates/docker-compose.yml.j2

@@ -1,10 +1,17 @@
 {% include 'roles/docker-compose/templates/base.yml.j2' %}
   application:
-    image: "{{ JOOMLA_IMAGE }}:{{ JOOMLA_VERSION }}"
-    container_name:  "{{ JOOMLA_CONTAINER }}"
+    build:
+      context: {{ docker_compose.directories.instance }}
+      dockerfile: Dockerfile
+    image: "{{ JOOMLA_CUSTOM_IMAGE }}"
+    container_name: {{ JOOMLA_CONTAINER }}
+    pull_policy: never
 {% include 'roles/docker-container/templates/base.yml.j2' %}
     volumes:
       - data:/var/www/html
+{% if JOOMLA_LDAP_ENABLED %}
+      - {{ JOOMLA_LDAP_CONF_FILE }}:/var/www/html/cli/cli-ldap.php:ro
+{% endif %}
     ports:
       - "127.0.0.1:{{ ports.localhost.http[application_id] }}:{{ container_port }}"
 {% include 'roles/docker-container/templates/healthcheck/curl.yml.j2' %}