Add DIB work dir to gitignore
Add DIB work dir to gitignore

Change-Id: I6f7582d3ae7f3bc16ddd5f742591c1e0ec40e5e4

uladz/sahara-image-elements,crobby/sahara-image-elements,openstack/sahara-image-elements,crobby/sahara-image-elements,openstack/sahara-image-elements,bigfootproject/sahara-image-elements,uladz/sahara-image-elements,bigfootproject/sahara-image-elements