Build PyTorch wheel via PEP 517 instead of setup.py

[shoumikhin]

Problem

Recent PyTorch nightlies removed python setup.py bdist_wheel. PyTorch now builds through scikit-build-core using the standard PEP 517 interface (pyproject.toml). The CI Docker image still builds PyTorch with setup.py, so bumping the pin to a newer nightly fails the image build with:

error: `python setup.py bdist_wheel` is deprecated: PyTorch is built with
scikit-build-core via the standard PEP 517 interface (pyproject.toml)...

Fix

Build the wheel with python -m build --wheel --no-isolation:

• python -m build is the standard PEP 517 frontend and works with PyTorch's scikit-build-core backend.
• --no-isolation makes PyTorch build against the image's numpy and toolchain (avoids a build-vs-runtime ABI mismatch) and lets the build reuse sccache.
• With isolation off the frontend does not install the build requirements, so they are installed explicitly, kept in sync with PyTorch's [build-system].requires.

The produced wheel still lands in dist/, so the install step is unchanged.

Testing

The Docker image build in this PR exercises the new build path end to end.

[pytorch-bot]

🔗 Helpful Links

🧪 See artifacts and rendered test results at hud.pytorch.org/pr/pytorch/executorch/21562

• 📄 Preview Python docs built from this PR

Note: Links to docs will display an error until the docs builds have been completed.

❌ 13 New Failures, 113 Cancelled Jobs, 17 Pending, 12 Unclassified Failures

As of commit 84917ae with merge base 4b4df96 ():

NEW FAILURES - The following jobs have failed:

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UNCLASSIFIED FAILURES - DrCI could not classify the following jobs because the workflow did not run on the merge base. The failures may be pre-existing on trunk or introduced by this PR:

• docker-builds / docker-build (executorch-ubuntu-22.04-gcc11-aarch64-android, linux.arm64.2xlarge) (gh) (this job did not run on the merge base, so DrCI cannot tell whether the failure is pre-existing)
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• docker-builds / docker-build (linux.4xlarge, executorch-ubuntu-22.04-clang12) (gh) (this job did not run on the merge base, so DrCI cannot tell whether the failure is pre-existing)
  #33 288.5 ERROR Missing dependencies:
• docker-builds / docker-build (linux.4xlarge, executorch-ubuntu-22.04-gcc11) (gh) (this job did not run on the merge base, so DrCI cannot tell whether the failure is pre-existing)
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• docker-builds / docker-build (linux.4xlarge, executorch-ubuntu-22.04-mediatek-sdk) (gh) (this job did not run on the merge base, so DrCI cannot tell whether the failure is pre-existing)
  #33 283.6 ERROR Missing dependencies:
• docker-builds / docker-build (linux.4xlarge, executorch-ubuntu-22.04-qnn-sdk) (gh) (this job did not run on the merge base, so DrCI cannot tell whether the failure is pre-existing)
  271.3 ERROR Missing dependencies:
• docker-builds / docker-build (linux.4xlarge, executorch-ubuntu-22.04-zephyr-sdk) (gh) (this job did not run on the merge base, so DrCI cannot tell whether the failure is pre-existing)
  268.5 ERROR Missing dependencies:
• docker-builds / docker-build (linux.4xlarge, executorch-ubuntu-24.04-gcc14) (gh) (this job did not run on the merge base, so DrCI cannot tell whether the failure is pre-existing)
  #33 307.3 ERROR Missing dependencies:
• docker-builds / docker-build (linux.4xlarge, executorch-ubuntu-26.04-gcc14) (gh) (this job did not run on the merge base, so DrCI cannot tell whether the failure is pre-existing)
  #33 287.2 ERROR Missing dependencies:

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