How to have a Moodle block add itself to the dashboard page for everyone

install.php

<?php
// This file is part of Moodle - http://moodle.org/
//
// Moodle is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// Moodle is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
// GNU General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with Moodle.  If not, see <http://www.gnu.org/licenses/>.

/**
 * Add site links block to the dashboard page for all users.
 *
 * @package block_ousitelinks
 * @copyright 2019 The Open University
 * @license http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
 */

defined('MOODLE_INTERNAL') || die();

/**
 * Adds block to dashboard.
 *
 * @param bool $evenwhentesting If true, add block even when testing
 * @throws moodle_exception
 */
function xmldb_block_ousitelinks_install(bool $evenwhentesting = false) {
    // Do not add block on test setup because it may break core tests. (This function can be
    // called with parameter true to force it to add for specific tests.)
    if (!$evenwhentesting && (PHPUNIT_TEST || defined('BEHAT_SITE_RUNNING'))) {
        return;
    }

    // Add block using API.
    $mypage = new moodle_page();
    $mypage->set_context(\context_system::instance());
    $mypage->set_pagelayout('mydashboard');
    $mypage->set_pagetype('my-index');
    $mypage->blocks->add_region('content');
    $mypage->blocks->get_regions();
    $mypage->blocks->add_block('ousitelinks', 'content', 0, true, 'my-index');
}