chore: Add Linux testing action for RxSwift

[clackary]

Pull Request Description

Adds an action to test RxSwift on Linux.

Acceptance Criteria

To be accepted into the Swift source compatibility test suite, a project must:

• be an Xcode or swift package manager project
• support building on either Linux or macOS
• target Linux, macOS, or iOS/tvOS/watchOS device
• be contained in a publicly accessible git repository
• maintain a project branch that builds against Swift 4.0 and passes any unit tests
• have maintainers who will commit to resolve issues in a timely manner
• be compatible with the latest GM/Beta versions of Xcode and swiftpm
• add value not already included in the suite
• be licensed with one of the following permissive licenses:
  • MIT
• pass ./project_precommit_check script run

Ensure project meets all listed requirements before submitting a pull request.

[clackary]

This still needs an xfail, but I wanted to verify it catches the failure.

Is there a way to ask swift-ci for a Linux test?

[shahmishal]

@swift-ci test

[shahmishal]

it will only verify macOS. However, the post merge testing will verify Linux.

@clackary can you verify this project builds with nightly main and release/6.0 docker images?

[clackary]

I have verified locally that both main and release/6.0 xfail on Linux due to swiftlang/swift#76039, so I expect that config to be fine.

root@94090f859dba:/project/swift-source-compat-suite# ./runner.py --swiftc /home/dev-toolchain/swift-DEVELOPMENT-SNAPSHOT-2024-09-18-a-ubuntu22.04-aarch64/usr/bin/swiftc --projects projects.json --include-actions 'action.startswith("BuildSwiftPackage")' --swift-branch main --include-repos 'path == "RxSwift"'
Building 1 projects across 4 parallel processes

XFAIL: https://github.com/swiftlang/swift/issues/76039, RxSwift, 5.0, b4307b, Swift Package
========================================
XFailures:
  XFAIL: https://github.com/swiftlang/swift/issues/76039, RxSwift, 5.0, b4307b, Swift Package
========================================
Action Summary:
     Passed: 0
     Failed: 0
    XFailed: 1
    UPassed: 0
      Total: 1
========================================
Repository Summary:
      Total: 1
========================================
Result: XFAIL
========================================


root@94090f859dba:/project/swift-source-compat-suite# ./runner.py --swiftc /home/dev-toolchain/swift-6.0-RELEASE-ubuntu22.04-aarch64/usr/bin/swiftc --projects projects.json --include-actions 'action.startswith("BuildSwiftPackage")' --swift-branch main --include-repos 'path == "RxSwift"'
Building 1 projects across 4 parallel processes

XFAIL: https://github.com/swiftlang/swift/issues/76039, RxSwift, 5.0, b4307b, Swift Package
========================================
XFailures:
  XFAIL: https://github.com/swiftlang/swift/issues/76039, RxSwift, 5.0, b4307b, Swift Package
========================================
Action Summary:
     Passed: 0
     Failed: 0
    XFailed: 1
    UPassed: 0
      Total: 1
========================================
Repository Summary:
      Total: 1
========================================
Result: XFAIL
========================================

As for macOS, it looks like RxSwift is passing on the main job and the release/6.0 job.

[shahmishal]

@swift-ci test