Start using a dedicated branch for prebuild iOS packages

[shoumikhin]

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[pytorch-bot]

🔗 Helpful Links

🧪 See artifacts and rendered test results at hud.pytorch.org/pr/pytorch/executorch/3183

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❌ 2 New Failures

As of commit 6774deb with merge base d3326a2 ():

NEW FAILURES - The following jobs have failed:

• Apple / build-frameworks-ios / macos-job (gh)
  RuntimeError: Command bash /Users/runner/work/_temp/exec_script failed with exit code 23
• pull / test-models-linux (cmake, llava_encoder, portable, linux.4xlarge, 90) / linux-job (gh)
  RuntimeError: Command docker exec -t 32c755fe040700507fe1580dd442fccc4b57960c53539b7f04a5ed394a804abc /exec failed with exit code 1

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