composer.json

{
    "require": {
        "altis/cloud": "^2.0",
        "altis/cms-installer": "0.3.2",
        "altis/core": "^2.0",
        "altis/media": "^2.0",
        "johnpbloch/wordpress": "5.3.*",
    },
    "require-dev": {
        "altis/dev-tools": "^2.0",
        "squizlabs/php_codesniffer": "^3.5"
    },
    "extra": {
        "installer-paths": {
            "content/{$name}/": [
                "type:wordpress-dropin"
            ],
            "content/mu-plugins/vendor/{$name}/": [
                "type:wordpress-muplugin"
            ],
            "content/plugins/{$name}/": [
                "type:wordpress-plugin"
            ]
        }
    },
    "autoload": {
        "files": [
            ".config/load.php"
        ]
    }
}

constants.php

<?php
use const ALTIS\ROOT_DIR;

/*
 * Multisite is always enabled, unless some spooky
 * early loading code tried to change that of course.
 *
 * This is that spooky early loading code.
 */
defined( 'MULTISITE' ) OR define( 'MULTISITE', false );

/*
 * No editing of files.
 */
defined( 'DISALLOW_FILE_EDIT' ) OR define( 'DISALLOW_FILE_EDIT', true );
defined( 'DISALLOW_FILE_MODS' ) OR define( 'DISALLOW_FILE_MODS', true );
// Use Circle CI for updates.
defined( 'AUTOMATIC_UPDATER_DISABLED' ) OR define( 'AUTOMATIC_UPDATER_DISABLED', true );