use correct timezone

lib/Commands/Compile.php

@@ -178,6 +178,7 @@ final class Compile extends Command
                 'MARIADB_PASSWORD' => 'studip',
                 'MARIADB_MYSQL_LOCALHOST_USER' => 'root',
                 'MARIADB_AUTO_UPGRADE'  => true,
+                'TZ' => 'Europe/Berlin',
             ],
             'healthcheck'    => [
                 'test'         => ["CMD", "healthcheck.sh", "--connect", "--innodb_initialized"],