The self-hosted macOS runner runs steps with `bash --noprofile --norc`, so
Homebrew's bin dir is not on PATH — the previous `brew install cmake` died with
`brew: command not found` (exit 127). Find brew at its known prefix, install cmake
only if missing, and export the brew bin dir to $GITHUB_PATH so the subsequent
xcframework build (audiopus_sys → vendored libopus) actually finds `cmake`.
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
enricobuehler
bcc5ec57f0