This method is meant to be overwritten to declare external actions for the controller.
It should return an array, with array keys being action IDs, and array values the corresponding
action class names or action configuration arrays. For example,
php
return [
'action1' => 'app\components\Action1',
'action2' => [
'class' => 'app\components\Action2',
'property1' => 'value1',
'property2' => 'value2',
],
];
[[\Yii::createObject()]] will be used later to create the requested action
using the configuration provided here.