We resolved the issue. Since XCode build runs on a virtual environment we have made use of the "ci_pre_xcodebuild.sh" script file (placed under "ci_scripts" folder of the project) and copying all font files into "~/Library/Fonts" folder. This indirectly installed all the custom fonts in the target machine before the build is generated thus resolving all the font's used within the project (mainly via storyboard) to stay intact. Hope this helps in your projects and also make way to use the "xcode cloud" build workflow.
ksundaram
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