fix: ensure proper Xdebug activation by mounting php.ini with higher priority

Modifies the volume mount point for the PHP configuration file to use a
numbered prefix (99-custom.ini) in the target path. This change ensures that
our custom PHP configuration is loaded last in the alphabetical processing
order of PHP's configuration files, giving it precedence over any automatically
generated configuration files. This fix resolves the issue where Xdebug was
being installed but not properly activated in the PHP environment, as our
custom settings now take priority over any conflicting defaults. This approach
follows standard practice in PHP configuration management for controlling
loading order priorities.

Author: nanoninja

docker-compose.yml

@@ -68,7 +68,7 @@ services:
                 PHP_TARGET: ${PHP_TARGET:-dev}
         restart: always
         volumes:
-            - "./etc/php/php.ini:/usr/local/etc/php/conf.d/custom.ini"
+            - "./etc/php/php.ini:/usr/local/etc/php/conf.d/99-custom.ini"
             - "./web:/var/www/html"
         environment:
             - PHP_DISPLAY_ERRORS=${PHP_DISPLAY_ERRORS:-1}