fix: restore preceding-comment for DATABASE_URL after env reorder

The previous arrangement put MARIADB_VERSION directly above DATABASE_URL
with no intervening comment, which fails scripts/check-env-coverage.sh's
"every variable in .env has a preceding description comment" rule.
Move MARIADB_VERSION (with its own comment block) above the DATABASE_URL
comment block so both variables retain a comment immediately above them.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

Author: turegjorup

.env

@@ -30,16 +30,16 @@ TRUSTED_PROXIES=127.0.0.1,REMOTE_ADDR
 ###< symfony/framework-bundle ###
 
 ###> doctrine/doctrine-bundle ###
+# Doctrine `serverVersion` for dialect selection — must match the running
+# MariaDB. Default tracks the docker-compose default (mariadb:11.4);
+# override MARIADB_VERSION (and the matching MARIADB_IMAGE in compose) to
+# test against 10.11.
+MARIADB_VERSION=11.4.4-MariaDB
 # Database connection string for MariaDB/MySQL.
 # Format described at https://www.doctrine-project.org/projects/doctrine-dbal/en/latest/reference/configuration.html#connecting-using-a-url
 # IMPORTANT: You MUST configure your server version, either here or in config/packages/doctrine.yaml
 #
 # DATABASE_URL="sqlite:///%kernel.project_dir%/var/data.db"
-# Doctrine's `serverVersion` controls the dialect, so it must match the
-# MariaDB you actually run. Default tracks the docker-compose default
-# (mariadb:11.4); override MARIADB_VERSION (and the matching MARIADB_IMAGE
-# in compose) to test against 10.11.
-MARIADB_VERSION=11.4.4-MariaDB
 DATABASE_URL="mysql://db:db@mariadb:3306/db?serverVersion=${MARIADB_VERSION}"
 #DATABASE_URL="postgresql://db_user:db_password@127.0.0.1:5432/db_name?serverVersion=13&charset=utf8"
 ###< doctrine/doctrine-bundle ###