core-bundle/src/Composer/ScriptHandler.php
public static function generateRandomSecret(Event $event): void
    {
        $extra = $event->getComposer()->getPackage()->getExtra();

        if (!isset($extra['incenteev-parameters']) || !self::canGenerateSecret($extra['incenteev-parameters'])) {
            return;
        }

        if (!\function_exists('random_bytes')) {
            self::loadRandomCompat($event);
        }

        putenv(static::RANDOM_SECRET_NAME.'='.bin2hex(random_bytes(32)));
    }
public static function generateRandomSecret(Event $event): void
    {
        $extra = $event->getComposer()->getPackage()->getExtra();

        if (!isset($extra['incenteev-parameters']) || !self::canGenerateSecret($extra['incenteev-parameters'])) {
            return;
        }

        if (!\function_exists('random_bytes')) {
            self::loadRandomCompat($event);
        }

        putenv(static::RANDOM_SECRET_NAME.'='.bin2hex(random_bytes(32)));
    }
Sets the environment variable with the random secret.