Add troubleshooting instructions for mariadb on debian

[ThisIsMissEm]

This is what I had to do and was stumped on this error:

php artisan migrate --force

   Illuminate\Database\QueryException 

  SQLSTATE[HY000] [2054] Server sent charset (0) unknown to the client. Please, report to the developers (Connection: mysql, SQL: select table_name as `name`, (data_length + index_length) as `size`, table_comment as `comment`, engine as `engine`, table_collation as `collation` from information_schema.tables where table_schema = 'pixelfed' and table_type in ('BASE TABLE', 'SYSTEM VERSIONED') order by table_name)

  at vendor/laravel/framework/src/Illuminate/Database/Connection.php:829
    825▕                     $this->getName(), $query, $this->prepareBindings($bindings), $e
    826▕                 );
    827▕             }
    828▕ 
  ➜ 829▕             throw new QueryException(
    830▕                 $this->getName(), $query, $this->prepareBindings($bindings), $e
    831▕             );
    832▕         }
    833▕     }

      +36 vendor frames 
  37  artisan:35
      Illuminate\Foundation\Console\Kernel::handle()

Turned out by default mariadb on debian 12 from the mariadb install guide uses a different character set.

[dansup]

Thanks for the helpful fix, I'm sure others will run into this issue!