Add 'docker-builds' to viable/strict requirement

[kirklandsign]

Summary

Need docker builds to pass before we advance viable/strict

Test plan

CI

[pytorch-bot]

🔗 Helpful Links

🧪 See artifacts and rendered test results at hud.pytorch.org/pr/pytorch/executorch/16282

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❌ 4 New Failures, 1 Unrelated Failure

As of commit adbfe34 with merge base df626bd ():

NEW FAILURES - The following jobs have failed:

• pull / test-openvino-linux / linux-job (gh)
  RuntimeError: Command docker exec -t bad381a09f2df2bcd42cab5ec39eedeffdc2243709ed813bdb68dd48729b5186 /exec failed with exit code 1
• Test CUDA Builds / export-model-cuda-artifact (openai, whisper-large-v3-turbo, quantized-int4-weight-only) / linux-job (gh)
  RuntimeError: Command docker exec -t 678ac28d4ee4094f4fd07a15fe72f6f391fa1459330259ee07458b9c7caa1cd7 /exec failed with exit code 1
• Test CUDA Builds / test-models-cuda (add) / linux-job (gh)
  RuntimeError: Command docker exec -t 9e343908ee7a61ec403c9648545664488e6042eca18ac231751c9e2614ab6aef /exec failed with exit code 1
• Test CUDA Builds / test-models-cuda (conv1d) / linux-job (gh)
  RuntimeError: Command docker exec -t 20222dd6097bc5ed48678e9f775a8599645e30aa24921e4e5ea1aac688172bf8 /exec failed with exit code 1

UNSTABLE - The following job is marked as unstable, possibly due to flakiness on trunk:

• pull / android / run-emulator (gh) (#16137)
  Timeout waiting for emulator to boot.

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[Copilot]

Pull request overview

This PR adds the docker-builds workflow to the list of required checks that must pass before advancing the viable/strict branch. This ensures that Docker build validation is part of the stability gate for the stable branch, alongside existing requirements like pull, lint, trunk, documentation builds, and Apple platform checks.

Key Changes:

• Adds "docker-builds" to the requires array in the update-viablestrict workflow configuration

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