Migrations inside composer scripts

Hello.
I have a composer package. It's like small cms (with db tables).
My target is to start migrations after package install/update from composer. In this case I use composer scripts. But there are no any autoloaded classes exist inside it.
composer.json:

Code:

{
    "name": "nwnpc/ci4-cms",
    "description": "Small seo friendly ci4 cms",
    "license": "MIT",
    "minimum-stability": "dev",
    "require": {
        "php": "^7.3 || ^8.0"
    },
    "autoload": {
        "psr-4": {
            "Velldoris\\": "src/"
        }
    },
    "scripts": "Velldoris\\Database\\Migration::install"
}

Velldoris\Database\Migration::install:

Code:

        try {
            $velldoris_app_config = config('Velldoris\\Config\\VelldorisApp');
            $db = \Config\Database::connect($velldoris_app_config->DBGroup);
            $db->getVersion();
        } catch (\Throwable $e) {
            print_r('Velldoris package installation error: ' . $e->getMessage());
            exit;
        }
   
        $migrations = service('Migrations', config('Config\Migrations'), $db);
        $migrations->setNamespace('Velldoris');
   
        try {
            $migrations->latest();
        } catch (\Throwable $e) {
            print_r('Velldoris package installation error: ' . $e->getMessage());
            exit;
        }

There is an error like "Codeigniter class not defined" while i try to init my method strict ("composer run-script post-install-cmd"). And it's not surprising.

Here are the solutions I see:
1) Load all project classes throught composer autoload.php
2) Use mysql dump instead of migrations (really?)