config folder

Hi,

I've got a Forge/Envoyer service which is deploying a small lumen (5.1) site. However, there is a config folder being created during deployment. This folder isn't in the repo either. So I assume Envoyer is creating it somewhere along the way.

When it comes to roll a new deploy and remove the historical ones, it's unable to delete it due to the folder permissions.

Purging old releases!
20160107162454
20160108092347
20160108092232
rm: cannot remove ‘20160107162454/config’: Permission denied
rm: cannot remove ‘20160108092347/config’: Permission denied
rm: cannot remove ‘20160108092232/config’: Permission denied

Checking the specific folder permission gives:

d-wxr----t  2 forge forge   4096 Jan 11 12:58 config

Anyone else seen/aware of this behaviour or can tell me what i've inadvertently enabled?