Add new file

<?php

$settings = [

    'cache' => [

        'value' => [

            'sid' => $_SERVER['DOCUMENT_ROOT'] . '#01',

            'type' => 'memcache',

            'memcache' => [

                'host' => '127.0.0.1',

                'port' => '11211',

            ],

        ],

        'readonly' => false,

    ],

    'exception_handling' => [

        'value' => [

            'debug' => false,

            'handled_errors_types' => E_ALL & ~E_USER_DEPRECATED & ~E_DEPRECATED & ~E_STRICT & ~E_USER_NOTICE & ~E_USER_WARNING & ~E_COMPILE_WARNING & ~E_CORE_WARNING & ~E_NOTICE & ~E_WARNING,

            'exception_errors_types' => E_ALL & ~E_USER_DEPRECATED & ~E_DEPRECATED & ~E_STRICT & ~E_USER_NOTICE & ~E_USER_WARNING & ~E_COMPILE_WARNING & ~E_CORE_WARNING & ~E_NOTICE & ~E_WARNING,

            'ignore_silence' => false,

            'assertion_throws_exception' => true,

            'assertion_error_type' => E_USER_ERROR,

            'log' => [

                'settings' => [

                    'file' => realpath(__DIR__ . '/../../logs/bitrix.log'),

                    'log_size' => 1000000,

                ],

            ],

        ],

        'readonly' => false,

    ],

    'composer' => [

        'value' => ['config_path' => realpath(__DIR__ . '/../../composer.json')],

    ],

];

if (getenv('RUN_MODE', true) === 'staging') {

    $settings = array_merge($settings, [

        'analytics_counter' => [

            'value' => [

                'enabled' => false

            ],

            'readonly' => false,

        ],

    ]);

}

if (getenv('RUN_MODE', true) === 'development') {

    $settings = array_merge($settings, [

        'cache' => [

            'value' => [

                'type' => 'memcache',

                'memcache' => [

                    'host' => 'memcached',

                    'port' => '11211',

                ],

                'sid' => $_SERVER['DOCUMENT_ROOT'] . '#01',

            ],

        ],

        'exception_handling' => [

            'value' => [

                'debug' => true,

                'handled_errors_types' => E_ALL & ~E_NOTICE & ~E_DEPRECATED,

                'exception_errors_types' => E_ALL & ~E_NOTICE & ~E_DEPRECATED,

                'ignore_silence' => true,

                'assertion_throws_exception' => true,

                'assertion_error_type' => E_ALL,

                'log' => null,

            ],

            'readonly' => false,

        ],

        'connections' => [

            'value' => [

                'default' => [

                    'className' => '\\Bitrix\\Main\\DB\\MysqliConnection',

                    'host' => 'db',

                    'port' => 3306,

                    'database' => 'cetera',

                    'login' => 'cetera',

                    'password' => 'cetera',

                    'options' => 2,

                ],

            ],

        ],

        'https_request' => [

            'value' => false,

        ],

        'analytics_counter' => [

            'value' => [

                'enabled' => false

            ],

            'readonly' => false,

        ],

    ]);

}

return $settings;