[Piglit] [PATCH v3] travis: add docker based cmake build job

[Eric Anholt]

Andres Gomez <agomez at igalia.com> writes:

> Until now we were only running the python unit tests.
>
> It seems desirable to also check that the CMake based build compiles
> successfully. We do that now using docker.
>
> The docker build can be tweaked with some environment variables and,
> also, be stored in the docker hub if desired. Check the changes for
> extra details regarding these variables.
>
> v2: Removed other build possibilities other than just from inside
>     Travis-CI, as suggested by Juan.
> v3: Replaced the "RELEASE" parameter to create the docker image with
>     "PARENT" and removed some unneeded documentation after v2, as
>     suggested by Juan.
>
> Cc: Dylan Baker <dylan at pnwbakers.com>
> Cc: Juan A. Suarez <jasuarez at igalia.com>
> Signed-off-by: Andres Gomez <agomez at igalia.com>
> Reviewed-by: Juan A. Suarez <jasuarez at igalia.com>

I'm definitely interested in extending our tests using Travis, but could
you add some comments explaining what this system does?  Do we do a
bunch of image build work (numpy/six/mako install) on each Travis build,
or does it get cached?  Do I need to do any setup in Travis in order for
this to take effect?
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