Johan Van de Wauw 08a905f614 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).		2020-09-14 18:11:11 -04:00
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doc	Fix external renderers example (#12841)	2020-09-14 18:11:11 -04:00
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