Investigate options for iOS builds on Linux
### Problem to solve Requiring MacOS runners to build iOS apps is cumbersome and expensive. There are solutions starting to emerge for building and signing iOS apps, though these aren't yet super mature it seems and don't easily work with in-place solutions like FastLane. - https://github.com/facebook/xcbuild - https://github.com/saucelabs/isign ### Target audience - Sasha, Software Developer, https://design.gitlab.com/research/personas#persona-sasha ### Further details Supporting a Linux-based iOS development infrastructure would help GitLab deliver solutions to more people without having to manage expensive and potentially complicated MacOS build infrastructure. ### Proposal TBD ### What does success look like, and how can we measure that? TBD ### Links / references cc @brendan @markpundsack
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