ci: Enable github arm workflow for sglang

[nv-tusharma]

Overview:

Add sglang ARM workflow to Github after completion of the wideep-sglang refactor. This PR uncomments the parts relevant to enable the sglang ARM workflow.

Details:

• Uncomment ARM workflow for sglang in Github

Summary by CodeRabbit

• Chores
  • Updated CI/CD workflow configuration to support multi-platform testing with improved parallel execution strategies.

[coderabbitai]

Walkthrough

The pull request modifies the GitHub Actions workflow configuration to enable matrix-based job execution for container validation. A strategy block is uncommented to support multi-platform testing across amd64 and arm64 architectures with distinct runner assignments, replacing the prior hard-coded runs-on setup.

Changes

Cohort / Cohort / File(s)	Summary
GitHub Actions Workflow Configuration .github/workflows/container-validation-backends.yml	Enables matrix strategy for sglang job with two platforms (amd64 with gpu-l40-amd64 runner, arm64 with cpu-arm-r8g-4xlarge runner), sets fail-fast to false, and updates job naming to include matrix.architecture variable.

Estimated code review effort

🎯 2 (Simple) | ⏱️ ~8 minutes

• Reviewable areas: Verify matrix platform definitions match intended runner requirements and that job naming convention updates correctly incorporate the architecture variable.

Poem

🐰 A workflow so fine, now runs on two kinds,
amd64 and arm64, working in tandem combined,
Matrix strategy, no hard coding in sight,
Container validation now scales left and right! ✨

Pre-merge checks

❌ Failed checks (2 warnings)

Check name	Status	Explanation	Resolution
Docstring Coverage	⚠️ Warning	Docstring coverage is 0.00% which is insufficient. The required threshold is 80.00%.	You can run @coderabbitai generate docstrings to improve docstring coverage.
Description Check	⚠️ Warning	The pull request description follows the template structure but lacks substantive content in most sections. While the Overview and Details sections contain some text describing the general intent to uncomment the ARM workflow for sglang, they provide minimal implementation detail. Critically, the "Where should the reviewer start?" section has no specific files called out, and the Related Issues section uses the template placeholder "closes GitHub issue: #xxx" without an actual issue number. The description does not guide reviewers on where to focus or link to related issue tracking, making it largely incomplete compared to the template requirements.	The author should update the PR description to include specific files that reviewers should examine (e.g., .github/workflows/container-validation-backends.yml) in the "Where should the reviewer start?" section and provide an actual GitHub issue number in the Related Issues section. Additional details about what was uncommented (the matrix-based strategy, platform configurations) and why this change was made would also strengthen the description.

✅ Passed checks (1 passed)

Check name	Status	Explanation
Title Check	✅ Passed	The PR title "ci: Enable github arm workflow for sglang" clearly describes the main change in the changeset, which is enabling matrix-based strategy support with ARM (arm64) platform configuration for the sglang job in the GitHub workflow file. The title is specific, concise, and directly reflects the primary objective of adding ARM workflow support. It avoids vague terminology and clearly communicates what was changed from a CI/infrastructure perspective.

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