Remove .ci/docker trigger on Apple workflows

[huydhn]

Reported by @metascroy on #6784, we shouldn't need to run Apple worklows when .ci/docker folder is updated because there is no docker at all on MacOS.

[pytorch-bot]

🔗 Helpful Links

🧪 See artifacts and rendered test results at hud.pytorch.org/pr/pytorch/executorch/6787

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❌ 2 New Failures

As of commit 5fcd8db with merge base c8967da ():

NEW FAILURES - The following jobs have failed:

• Apple / build-demo-ios / macos-job (gh)
  RuntimeError: Command bash /Users/runner/work/_temp/exec_script failed with exit code 74
• pull / unittest / linux / linux-job (gh)
  extension/llm/modules/test/test_mha.py::AttentionTest::test_attention_executorch

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