ci: Move macOS jobs to the macos-26 runner and Xcode 26#109
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Restructure CI to mirror swift-core: the library and its tests run on the full OS matrix via the pure-Swift toolchain (swift test), and Xcode is confined to the one job that genuinely needs it. - Collapse the separate test-macos / test-linux / test-windows jobs into a single matrixed `test` job running `swift test` on linux (6.0/6.1), macos, and windows. The macOS entry uses macos-26 + Xcode 26, the toolchain Apple requires for App Store submission as of 2026-04-28 (on macOS `swift` comes from the selected Xcode). - build-apple is the only xcodebuild job: it cross-compiles to iOS/tvOS/watchOS/macOS (SwiftPM cannot target the non-host Apple platforms). Bumped to macos-26 / Xcode 26. - lint drops its setup-xcode step; swiftlint is a standalone binary. - contract-tests stays on macOS + Xcode 26: its Kitura-based service pulls in BlueSSLService, which uses the OpenSSL 1.1 API removed in OpenSSL 3 and so cannot build on the Linux (Ubuntu 24.04) swift container. test-thread-sanitizer already runs on Linux (added in the preceding commit). Orthogonal to the deployment floor: Apple's mandate governs the build SDK, not the deployment target, so the iOS 15 / macOS 11 floor (SDK-2632) is unaffected.
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Apple requires App Store uploads to be built with Xcode 26 / the iOS 26 SDK as of
2026-04-28. Building and testing on Xcode 26 validates the library against the
toolchain consumers must now use. GitHub's macos-26 runner (GA) ships Xcode 26.x.
Bumps the five macOS jobs (lint, build-apple, test-macos, test-thread-sanitizer,
contract-tests) from macos-15 / Xcode 16.4 to macos-26 / Xcode 26 (pinned to the
latest 26.x via
xcode-version: '26'). test-linux and test-windows are unchanged.Orthogonal to the deployment floor: Apple's mandate governs the build SDK, not the
deployment target, so the iOS 15 / macOS 11 floor (SDK-2632) is unaffected.
Note
Low Risk
Changes are limited to CI workflow configuration; no library runtime, auth, or deployment-target behavior is modified.
Overview
Aligns GitHub Actions with Apple’s App Store toolchain requirement (Xcode 26 / iOS 26 SDK by 2026-04-28) by moving
lint,build-apple, andcontract-teststomacos-26, pinningxcode-version: '26'wherexcodebuildor an explicit toolchain is needed, and dropping redundant Xcode setup fromlint(runner default).test-macos,test-linux, andtest-windowsare replaced by a singletestjob with a matrix (Swift 6.0/6.1 on Linux containers, macOS with conditional Xcode 26 selection, Windows withgha-setup-swift6.1), all using./.github/actions/test-swiftpm.test-thread-sanitizerstays on Ubuntu/swift:6.1.Adds a short workflow comment explaining pure-Swift vs
xcodebuildjobs and why contract-tests remain macOS-only (Kitura/OpenSSL 1.1).Reviewed by Cursor Bugbot for commit 704b28b. Bugbot is set up for automated code reviews on this repo. Configure here.