Alter the full list of installation tasks.
This hook is invoked on the install profile in install_tasks().
$tasks: An array of all available installation tasks, including those provided by Drupal core. You can modify this array to change or replace any part of the Drupal installation process that occurs after the installation profile is selected.
$install_state: An array of information about the current installation state.
function hook_install_tasks_alter(&$tasks, $install_state) {
// Replace the "Choose language" installation task provided by Drupal core
// with a custom callback function defined by this installation profile.
$tasks['install_select_locale']['function'] = 'myprofile_locale_selection';
}