This patch builds off of Martin's ansible tasks commit (2b720ca).
I've added a Dockerfile in the 'libtaskotron/ext/' directory as
well as a module to 'libtaskotron/ext/disposable' for dealing with
This expects a docker daemon to be running on the host (so is akin
to --libvirt), and will build the 'taskotron-worker' image if it's
not already found on the system.
Testing this is very similar to testing the patch Martin wrote,
except you use the '--docker' flag during invocation.
$ git clone https://github.com/stefwalter/gzip-dist-git
$ sudo runtask -d -i gzip -t koji_build -a x86_64 --docker gzip-dist-git/tests/test_rpm.yml