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Fix external renderers example (#12841) 

* libffi-dev is required for building jupyter
* matplotlib can not be installed using wheels on the used version of alpine
  linux, which means it must be compiled and  a large number of other packages
  have to be installed as well.
  This is very inefficient: see eg.
  https://pythonspeed.com/articles/alpine-docker-python/

  Apart from that, matplotlib is actually not required for rendering
  notebook files in gitea and it will pull in other dependencies which take some
  time to build (ie numpy).
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Johan Van de Wauw 2020-09-15 00:11:11 +02:00 committed by GitHub
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docs/content/doc/advanced/external-renderers.en-us.md
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@ -36,12 +36,12 @@ FROM gitea/gitea:{{< version >}}
COPY custom/app.ini /data/gitea/conf/app.ini
[...]
RUN apk --no-cache add asciidoctor freetype freetype-dev gcc g++ libpng python-dev py-pip python3-dev py3-pip py3-pyzmq
RUN apk --no-cache add asciidoctor freetype freetype-dev gcc g++ libpng libffi-dev python-dev py-pip python3-dev py3-pip py3-pyzmq
# install any other package you need for your external renderers
RUN pip3 install --upgrade pip
RUN pip3 install -U setuptools
RUN pip3 install jupyter matplotlib docutils
RUN pip3 install jupyter docutils
# add above any other python package you may need to install
```