Add host-mounted font support and automatic fc-cache refresh

[jackkenney10]

Description

Added support for fonts installed on host OS to be mounted in the anthias-viewer container, and for the font cache to be rebuilt at container startup. Users may install additional fonts in the host OS (such as font-noto-color-emoji), and they will be available for use by the Webviewer in the anthias-viewer container.

Syncing of fonts is achieved by mounting /usr/share/fonts to /usr/share/fonts in anthias-viewer. Rebuilding of the font cache at container startup is achieved by running fc-cache -f -v in entrypoint.sh, which has been made the entrypoint for the anthias-viewer container.

This will address issue #2272.

I made minimal changes to the Dockerfile to support host-mounted fonts and automatic fc-cache refresh at container startup. Tested successfully on Raspberry Pi. No core application logic was changed.

Checklist

• I have performed a self-review of my own code.
• New and existing unit tests pass locally and on CI with my changes.
• I have done an end-to-end test for Raspberry Pi devices.
• I have tested my changes for x86 devices.
• I added a documentation for the changes I have made (when necessary).

[nicomiguelino]

@jackkenney10, please let me take some time to test the changes across supported platforms (Raspberry Pi, x86).

[nicomiguelino]

@jackkenney10, please don't forget to include in the description that this PR will fix #2272.

[nicomiguelino]

The changes works well for the Raspberry Pi OS Lite or Debian version. However, users who installed the balenaOS version of Anthias have minimal to no control over the fonts, if they wish to install it.

It would be better if fonts like the Noto Color Emoji will be installed automatically, while still keeping the option to add fonts to the host /usr/share/fonts.

[jackkenney10]

Nico,

Thank you for your review and feedback. I did not consider the case of users on balenaOS. I will investigate which fonts should be installed automatically, implement this, and update the branch with the change.

Thank you! :)

[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud

[jackkenney10]

Nico,

I'm still working on this. I'm trying to find an approach that allows both host-mounted font support, as well as an automatic install of fonts in the viewer container during build. There is nothing new to review yet. Hopefully I can figure this out soon.

[nicomiguelino]

Hi @jackkenney10, just checking in on this PR — do you have an update? We'd love to get this moving again. Let me know if there's anything I can do to help.

[jvendryes]

Just checking in to see if there are any updates to this PR? Would be useful for me as well.

[jackkenney10]

Team, I let this one slip off my radar after I got it working on my one pi. I apologize. I'll be out of town and unable to work on this until next weekend, but I'll take another look when I'm back.