Assets files are not refreshed after updating

[fae7em]

What steps will reproduce the problem?

If in a new version of humhub, there are some changes in assets files, the assets directory are not re-published and use the old assets files.

like humhub/humhub#4605 issue, that new feature is not working because of assets cache.

Updater should clean the assets directory, to force Yii to re-publish assets files.

[buddh4]

@luke- do you think this is a problem regarding performance since flushing assets takes some time (and will delay the update process even more). Also currently active users will have to reload the page in order for new assets to be updated. Maybe related to humhub/humhub#4514

[fae7em]

We can put it in the CleanUp step to run just one time and at the end of the updating process.

https://github.com/humhub/humhub-modules-updater/blob/2ef8d88aa6f0d87e4a43ad0c1899cdb25bd058bb/modules/packageinstaller/controllers/InstallController.php#L87-L96

[luke-]

Yes, as very last step would be the safest way.