In order to build the iOS app with the Xcode version that is installed
on the GitHub runners, we need to select the Xcode version by major and
minor version. Currently, the iOS builds are failing because Xcode 26.1
also exists but iOS 26.1 isn't supported (or released?).
See
https://github.com/firezone/firezone/actions/runs/18239282351/job/51938727311.
To avoid burning Azure credits, we move the runners back down to the
free tier. Now that caching is properly set up, this should incur only a
minor increase in CI time.
When updating the provisioning profiles (i.e. when changing anything the
Apple Developer Portal), we needed to manually update these build
scripts to point to the new UUIDs.
This can be made simpler to automatically pull it out of the profiles in
CI.
Somewhere between Xcode 16.0 and Xcode 16.3, the API for the libresolv
functions we call changed slightly, and we can now pass the return value
of `__res_9_state()` directly to the `res_9_ninit`, `res_9_ndestroy` and
`res_9_getservers` functions.
A particular version of Xcode locks in particular versions of SDKs to
build against. If we hardcode this, the benefit is that we have a
predictable and repeatable build environment.
The downside is whenever GitHub updates its macOS runner images, we
could fail to build due to a version mismatch.
In general, drift between Xcode versions isn't a problem, and tracking
the latest will more closely track developer's machines.
The CI swift workflow needs to be updated to accommodate the macOS
standalone build. This required a decent amount of refactoring to make
the Apple build process more maintainable.
Unfortunately this PR ended up being a giant ball of yarn where pulling
on one thread tended to unravel things elsewhere, since building the
Apple artifacts involve multiple interconnected systems. Combined with
the slow iteration of running in CI, I wasn't able to split this PR into
easier to digest commits, so I've annotated the PR as much as I can to
explain what's changed.
The good news is that Apple release artifacts can now be easily built
from a developer's machine with simply
`scripts/build/macos-standalone.sh`. The only thing needed is the proper
provisioning profiles and signing certs installed.
Since this PR is so big already, I'll save the swift/apple/README.md
updates for another PR.
