[latex+matplotlib] missing CJKutf8.sty file

[mmcky]

It looks like the GitHub actions environment is missing the CJKutf8.sty file

! LaTeX Error: File `CJKutf8.sty' not found.

We may need to add this manually or add an install for the instance.

[mmcky]

@mmcky to add

sudo apt-get install latex-cjk-all