[Buildbot] #2956: Provide latent Docker build slave

[Buildbot trac]

#2956: Provide latent Docker build slave
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Reporter:  sa2ajj                 |       Owner:
    Type:  enhancement            |      Status:  new
Priority:  patches-accepted       |   Milestone:  0.9.+
 Version:  master                 |  Resolution:
Keywords:  docker, slave, latent  |
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Comment (by Ben):

 Been working on that over the weekend. With nice results !

 1 trouble: We need to hardcode the master hostname, the slave name and
 password in the Dockerfile. For the master name, it would be good to use
 the {{{--add-hosts}}} cli parameter, unfortunately I found no way to give
 it through the docker API :( probably worth a bug by docker. Or the doc I
 found is not up-to-date.

 I also would love to add the possibility to build a container if the
 requested one is not found. Probably through giving a Dockerfile as
 parameter to the slave. This would allow us to require no preliminary
 setup on the docker side.

 I still need to write the doc, add some tests, and we're ready to go !

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Ticket URL: <http://trac.buildbot.net/ticket/2956#comment:8>
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