Add SwiftPM GitHub CI support

[Kyle-Ye]

I have tested this on my fork. You can check it here

[Kyle-Ye]

I'm also considering adding Xcode CI in this PR. But I encounter some strange issue when using xcodebuild to build the example target.

xcodebuild build \
            -scheme Life \
            -configuration Release \
            -skipMacroValidation -skipPackagePluginValidation \
            -destination "platform=macos"

The error message is as following

xcodebuild: error: Could not resolve package dependencies:
  Invalid manifest (compiled with: ["/Library/Developer/Toolchains/swift-DEVELOPMENT-SNAPSHOT-2024-03-07-a.xctoolchain/usr/bin/swiftc", "-vfsoverlay", "/var/folders/hs/g5q9gn6d5tx6_3bxmq1pj0rw0000gp/T/TemporaryDirectory.pY2hLP/vfs.yaml", "-L", "/Applications/Xcode-15.3.0.app/Contents/SharedFrameworks/SwiftPM.framework/SharedSupport/ManifestAPI", "-lPackageDescription", "-Xlinker", "-rpath", "-Xlinker", "/Applications/Xcode-15.3.0.app/Contents/SharedFrameworks/SwiftPM.framework/SharedSupport/ManifestAPI", "-target", "arm64-apple-macos13.0", "-sdk", "/Applications/Xcode-15.3.0.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX14.4.sdk", "-swift-version", "5", "-I", "/Applications/Xcode-15.3.0.app/Contents/SharedFrameworks/SwiftPM.framework/SharedSupport/ManifestAPI", "-sdk", "/Applications/Xcode-15.3.0.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX14.4.sdk", "-package-description-version", "5.9.0", "-Xfrontend", "-serialize-diagnostics-path", "-Xfrontend", "/Users/kyle/Library/Caches/org.swift.swiftpm/manifests/ManifestLoading/life.dia", "/Users/kyle/Developer/Playdate/swift-playdate-examples/Examples/Life/Package.swift", "-disallow-use-new-driver", "-o", "/var/folders/hs/g5q9gn6d5tx6_3bxmq1pj0rw0000gp/T/TemporaryDirectory.gc8PVm/life-manifest"])
<unknown>:0: warning: legacy driver is now deprecated; consider avoiding specifying '-disallow-use-new-driver'
<unknown>:0: error: unable to execute command: <unknown>

I can't solve it in a short time. So I guess we can add the SwiftPM CI first which at least provides a layer of promise that new PR will not break SwiftPM build.

[Kyle-Ye]

Xcode version does not matter here on SwiftPM CI as we are using nightly Swift toolchain here.

Xcode 15.3 is not used because the upstream runner does not support it yet.

actions/runner-images#9459

[Kyle-Ye]

Do you prefer to use the latest nightly toolchain or use a fixed nightly version here?

[Kyle-Ye]

1. Fixed version: "2.4.1" (The current latest version)
2. Fixed version: "2.1.1" (Aligned with the current documentation description and screenshot)
3. Dynamic version: "latest" (Update automatically when there is a new version)

[Kyle-Ye]

TOOLCHAIN=xx is injected into env automatically in SwiftyLab/setup-swift@latest step

[rauhul]

@DougGregor I'm not sure about the Swift project's policy regarding CI with Github Actions currently, could you chime in?

[Kyle-Ye]

@DougGregor I'm not sure about the Swift project's policy regarding CI with Github Actions currently, could you chime in?

IIRC, we should ask @shahmishal for Swift CI related thing

Related Post: https://forums.swift.org/t/dropping-support-for-swift-ci-test-and-merge-in-favor-of-auto-merge-feature-on-github/68297

[shahmishal]

Apple has GitHub actions disabled at the organization level, so running for PRs won't have any effect - individuals can enable GitHub actions on their own forks if they are so inclined. ci.swift.org is used for testing most other swift-family projects.

[Kyle-Ye]

Apple has GitHub actions disabled at the organization level, so running for PRs won't have any effect - individuals can enable GitHub actions on their own forks if they are so inclined. ci.swift.org is used for testing most other swift-family projects.

Is there any existing CI workflow on ci.swift.org for this repo.
Looks like we did not run swift test before a merge currently.

Do we need to add such CI to ci.swift.org for this repo or enable GitHub action for this repo? @rauhul