[Merge] ~samirakarioh/livecd-rootfs:fix-oci-bug into livecd-rootfs:ubuntu/master

[Samir Akarioh]

> just out of curiosity, could you drop a quick comment with a few lines
> describing how you've tested that this change actually fixes our CI issue?
> 
> either way, it lgtm

I try to build multiple tar.gz with differents args thanks to ubuntu-bartender.Also i build a tar.gz with the most args coming from the command used by Jenkins.
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https://code.launchpad.net/~samirakarioh/livecd-rootfs/+git/livecd-rootfs/+merge/430632
Your team Ubuntu Core Development Team is requested to review the proposed merge of ~samirakarioh/livecd-rootfs:fix-oci-bug into livecd-rootfs:ubuntu/master.