BOT-575: Deprecate Intel macOS runners

[stephen-derosa]

Deprecate Intel macOS CI runners and release bundles. macOS builds, unit/integration/stress tests (including nightly runs through the reusable test workflow), and releases now run only on Apple Silicon.

• Remove macos-x64 from the build, test, and release matrices and release archive list.
• Remove Intel-only Rust target installation and architecture overrides.
• Remove Intel macOS from the supported platform list.

Validation: actionlint v1.7.12 passed for all three modified workflows (ShellCheck disabled); git diff --check passed. SDK builds and integration tests were not run for these CI changes.

BOT-575

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[devin-ai-integration]

Note

Newer findings are available below. Devin Review posted a newer report on this PR, in addition to the findings presented here.

✅ Devin Review: No Issues Found

Devin Review analyzed this PR and found no bugs or issues to report.

[devin-ai-integration]

Devin Review found 1 new potential issue.

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[devin-ai-integration]

🟡 Linux alias artifacts cannot support CMake consumers

Downloading either livekit-sdk-linux-* artifact yields build-tree files without the installed CMake package. Consumers using find_package(LiveKit CONFIG) cannot load the SDK from these aliases.

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The Ubuntu build installs a complete bundle under sdk-out/livekit-sdk-${{ matrix.name }} through install_bundle. The bundle check verifies its CMake config and build metadata, but the aliases upload only raw build-release/lib, include, and bin. The installed lib/cmake/LiveKit and share/livekit/build-info.json are absent from those alias downloads. Both architecture aliases use the same pattern.

Example: A consumer downloads livekit-sdk-linux-x64 and sets CMAKE_PREFIX_PATH to its extracted directory. find_package(LiveKit CONFIG REQUIRED) fails because there is no lib/cmake/LiveKit/LiveKitConfig.cmake; the Ubuntu-named SDK artifact contains it.

Recommended fix: Upload the verified installed sdk-out/livekit-sdk-${{ matrix.name }} bundle under each legacy alias name, just as the primary artifact step does. Check both alias downloads for the CMake config and build metadata.

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