base.config.php

<?php
$CONFIG = array (
  'passwordsalt' => getenv('PASSWORD_SALT'),
  'secret' => getenv('SECRET'),
  'trusted_domains' =>
  array (
    0 => getenv('NEXTCLOUD_TRUSTED_DOMAINS') ?: 'localhost',
  ),
  'overwrite.cli.url' => getenv('OVERWRITE_CLI_URL') ?: 'http://localhost',
  'overwriteprotocol' => getenv('OVERWRITE_PROTOCOL') ?: '',
  'version' => getenv('VERSION'),
  'debug' => getenv('DEBUG'),
  'instanceid' => getenv('INSTANCE_ID'),
  'config_is_read_only' => getenv('CONFIG_READONLY') ?: false,
  'updatechecker' => getenv('UPDATE_CHECKER') ?: false,
  'updater.server.url' => getenv('UPDATE_URL') ?: 'https://updates.nextcloud.com/updater_server/',
  'updater.release.channel' => getenv('UPDATE_CHANNEL') ?: 'stable',
  'upgrade.disable-web' => getenv('UPDATE_DISABLE_WEB') ?: 'false',
);