[PATCH 1/1] Dockerfile: add graphviz

[Tom Rini]

On Thu, Jan 16, 2020 at 08:51:09PM +0100, Heinrich Schuchardt wrote:

> In reStructured text documentation we somtimes find formatting problems.
> Therefore I would like to add 'make htmldocs' to our Gitlab Ci steps and
> let all warning result in a build failure.
> 
> For building the htmldocs target without warnings we need the Graphviz
> package.
> 
> Signed-off-by: Heinrich Schuchardt <xypron.glpk at gmx.de>

Applied to gitlab-ci-runner/master, thanks!

There's a new bionic tag so I'll be updating all of the images shortly
to contain this as well.

-- 
Tom
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