Create Arm64 Graviton instance docker image

[mergennachin]

Summary:

• Let's see if we can set this up first.

In follow up PRs, here's the plan:

• We will add a few CI jobs to run on this docker image and on Arm64 Graviton instance.
• Will migrate some jobs from macOS runners to this.

[pytorch-bot]

🔗 Helpful Links

🧪 See artifacts and rendered test results at hud.pytorch.org/pr/pytorch/executorch/9199

• 📄 Preview Python docs built from this PR

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❌ 2 New Failures, 2 Cancelled Jobs

As of commit 7023d7a with merge base c183ef0 ():

NEW FAILURES - The following jobs have failed:

• Check Labels / Check labels (gh)
• docker-builds / docker-build (executorch-ubuntu-22.04-gcc11-aarch64, linux.arm64.2xlarge) (gh)
  Process completed with exit code 1.

CANCELLED JOBS - The following jobs were cancelled. Please retry:

• pull / test-llava-runner-linux / linux-job (gh)
  ##[error]The operation was canceled.
• pull / unittest-arm / linux-job (gh)
  ##[error]The operation was canceled.

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[github-actions]

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[mergennachin]

Will monitor this:

https://github.com/pytorch/executorch/actions/runs/13821538175/job/38667868577?pr=9199