Use depot runners for Mac builds

[maschwenk]

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Have y'all considered using Depot's runners for your builds? Depot has good pricing for the larger runners and will handle all the ephemeral infrastructure for you. May not be able to cover some of the legacy configurations but worth looking into. We've had a good experience with it, at your PR volume might be worth it.

https://depot.dev/docs/github-actions/runner-types#macos-runners

[carlocab]

Thanks for the PR, but depot runners don't look suitable for our needs.

Depot provides only macOS runners running macOS 14 on Apple Silicon. We rely on GitHub providing Intel runners and Apple Silicon runners of various macOS versions. See:

brew/Library/Homebrew/github_runner_matrix.rb

Lines 128 to 131 in 69849e1

	NEWEST_GITHUB_ACTIONS_INTEL_MACOS_RUNNER = :ventura
	OLDEST_GITHUB_ACTIONS_INTEL_MACOS_RUNNER = :monterey
	NEWEST_GITHUB_ACTIONS_ARM_MACOS_RUNNER = :sequoia
	OLDEST_GITHUB_ACTIONS_ARM_MACOS_RUNNER = :sonoma