CI: Optimize builds and cancel in flight builds#768
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We want to cancel in progress jobs since we dont really need them; just always run on the latest pushed code immediately, freeing up resources more eagerly
Drop Swift 6.2 from Linux jobs and reduce macOS jobs to Swift 6.3 only. verify-samples is now 6.3 only on both platforms since the 7-sample fan-out was the largest contributor (was 28 Linux + 14 macOS = 42 jobs; now 7 + 7 = 14). Linux still covers 6.1.3 and nightly via test-swift. Saves ~32 jobs per PR.
ktoso
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Trying to improve caching to speed up the samples builds as well |
Each Samples/<name>/Package.swift declares swift-java as a path: "../../" dependency, so every sample's `swift build` recompiles the entire swift-java tree (including swift-syntax) into its own .build dir. With seven samples this is ~7x duplicated work and dominates CI time. Add an actions/cache step to verify-samples and verify-samples-macos that caches Samples/<sample>/.build keyed on swift-java sources + sample sources + Swift toolchain version, with restore-keys so partial reuse kicks in even when swift-java sources change. SwiftPM's incremental build then rebuilds only what actually changed. The bigger structural win (re-enabling --experimental-prebuilts to skip swift-syntax entirely) is still blocked on swiftlang#418 and tracked separately.
ktoso
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We have too many builds now, because we test every sample and on many platforms and swift versions. This is too extreme since they don't really differ much.
We want to cancel in progress jobs since we dont really need them; just always run on the latest pushed code immediately, freeing up resources more eagerly
We also improve build caching for the samples