Instantiate ConfigurationLoaderFactory when not in container

[scottasmith]

Allow multi-connection based migration other than just orm_default. This is useful if the migrations tables need to exist in multiple different databases or schemas.

e.g.

Config

    'doctrine' => [
        ...
        'migrations' => [
            'orm_default' => [...],
            'orm_other_connection' => [...],
        ],
        ...
    ],

bin/doctrine

$input = new ArgvInput();

/** @var string $em */
$em = $input->getParameterOption('--em', 'orm_default');


// hack to remove the --em option, cause it's not supported by the original ConsoleRunner.
foreach ($_SERVER['argv'] as $i => $arg) {
    if (str_starts_with($arg, '--em=')) {
        unset($_SERVER['argv'][$i]);
    }
}

try {
    $entityManager = $container->get('doctrine.entity_manager.' . $em);
} catch (NotFoundExceptionInterface $serviceNotFoundException) {
    throw new InvalidArgumentException(sprintf('Missing entity manager with name "%s"', $em));
}

$commandFactory = new CommandFactory($em);

$commands = [
    $commandFactory($container, Command\CurrentCommand::class),
    ...
];

...

[Slamdunk]

I'm staring at the code and can't figure out why we haven't done $configurationLoader = (new ConfigurationLoaderFactory($configKey))($container); since the beginning 🤔

Overall looks good, but I'd like you to extend the README.md to include when and how to leverage this new feature

[scottasmith]

Overall looks good, but I'd like you to extend the README.md to include when and how to leverage this new feature

Thanks @Slamdunk. I have updated the README.md