Find Swift Test Coverage in Either Build System's Layout

[PSchmiedmayer]

♻️ Current situation & Problem

Swift 6.4's default build system writes its products to .build/out/Products/<Config>-<platform>, with one <Target>Tests.so per test target instead of a .xctest.
The coverage step of swift-test.yml only searched the native layout (.build/<triple>/<config>/codecov and *.xctest), found nothing, and llvm-cov export failed with "exactly one of -instr-profile and -empty-profile must be specified".
Every caller that sets artifact_name fails on Swift 6.4 even though its tests pass, for example SchmiedmayerLab/MyHeartCounts-iOS#204.

⚙️ Release Notes

• Find the coverage profile and the test binaries in either build system's layout, and export coverage from every test binary, passing additional ones as -object.

📚 Documentation

A two-line comment in the step names both layouts.

✅ Testing

actionlint passes.
The exact step was run in Swift 6.4 on Linux against MyHeartCountsShared: with the default build system it exports 402 LCOV records from the test .so, and with --build-system native 342 records from the .xctest.

Code of Conduct & Contributing Guidelines

• I agree to follow the Code of Conduct and Contributing Guidelines.

[coderabbitai]

Important

• 🔍 Trigger review

This repository does not receive automatic reviews because it has fewer than 10 stars.

⚙️ Run configuration

Configuration used: Organization UI

Review profile: CHILL

Plan: Advanced

Run ID: 05f637dc-c678-4611-a5e3-79047ac57188

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