Add work around to rebuld font cache
https://bugs.launchpad.net/snapcraft/+bug/1897098 cmd: fc-cache -r
When a snap or a font is updated font cache needs a rebuild, or squares will be displayed.
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https://bugs.launchpad.net/snapcraft/+bug/1897098 cmd: fc-cache -r
When a snap or a font is updated font cache needs a rebuild, or squares will be displayed.