Set bucket name in Hook

[Suranex]

Hey,

we need an environment-dependent S3 configuration. With the help of the initialiseClient-preProcessing hook, we can already set all configurations except for the bucket name. This is read from the FAL configuration ($this->configuration['bucket'] at many places). It would therefore be desirable to have a hook to change the FAL configuration or simply the bucket name overwritable. Can you add a hook for this?

class AmazonS3DriverHook {
    public function initializeClient(array &$params, $obj) {
        $params['configuration']['bucket'] = 'some-name';  ## doesn't work
        $params['configuration']['region'] = 'someregion';  ## works
        $params['configuration']['key'] = 'somekey';  ## works
        $params['configuration']['secretKey'] = 'somesecret';  ## works
        $params['configuration']['customHost'] = 'https://yout-endpoint';  ## works
    }
}

[cweiske]

This is already possible in config/system/additional.php: #145