#6037: Create .xz images for docker builds

[Fedora Release Engineering]

#6037: Create .xz images for docker builds
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 Reporter:  kushal           |       Owner:  rel-eng@…
     Type:  task             |      Status:  new
Milestone:  Fedora 21 Final  |   Component:  koji
 Keywords:                   |  Blocked By:
 Blocking:                   |
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 Currently we provide .tar.gz output for Fedora docker builds in Koji. But
 the Docker team prefers to have .xz compressed image. We should have .xz
 as output in future builds.

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Ticket URL: <https://fedorahosted.org/rel-eng/ticket/6037>
Fedora Release Engineering <http://fedorahosted.org/rel-eng>
Release Engineering for the Fedora Project