Subject: [bug#30572] [PATCH 4/7] docker: Allow the use of a custom temporary directory.

From: Danny Milosavljevic <[email-masked]>
Date: Mon, 26 Feb 2018 01:48:59 +0100

Hmm, I have a slight preference for not magically adding "/docker-image" here
but rather adding it in the caller and in the default.

But LGTM...