turing complete with a stack of 0xdeadbeef

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Selecting an Xcode version on GitHub Actions CI

I have started using GitHub Actions for CI on a new project as a replacement for my usual setup on Travis CI. It generally seems to be much faster and more reliable so far. It also has an equivalent feature set, as far as I can tell. But one issue that I have run into is selecting a specific Xcode version, which is a bit cumbersome and not fully documented.