Test GB300 runners

[msarahan]

Use the shared-workflows test-gb300 branch to exercise Grace+Blackwell, mirroring the existing GH200 test PR. Requires rapidsai/shared-workflows#591 and nv-gha-runners/enterprise-runner-configuration#401.\n\nValidation: pre-commit run --files .

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📝 Walkthrough

Summary by CodeRabbit

• Chores
  • Updated CI workflows to pin reusable workflow references to test-gb300 instead of main, including build, test, docs, wheels, and devcontainer pipelines.
  • Bumped rapidsai/ci-conda to 26.10-latest for docs and C++ debug test runs.
  • Adjusted file-change detection to also exclude !.yamllint.yaml.
  • Added branch-gated API documentation publishing and a CMake test job to the PR pipeline.
  • Increased C++ test timeout from 15m to 30m.

Walkthrough

Reusable GitHub Actions workflows are retargeted from @main to @test-gb300 across build, pull-request, test, and breaking-change alert workflows. CMake testing and API documentation publishing jobs are added, selected container images are updated, and the C++ test timeout is extended.

Changes

Workflow updates

Layer / File(s)	Summary
Build and publishing pipeline .github/workflows/build.yaml	Build, documentation, package upload, wheel, and devcontainer jobs use @test-gb300; branch builds add API documentation publishing.
Pull-request validation and documentation .github/workflows/pr.yaml	Pull-request workflows use @test-gb300 for shared jobs and add CMake testing plus dry-run API documentation publishing.
Test and breaking-change workflows .github/workflows/test.yaml, .github/workflows/trigger-breaking-change-alert.yaml	Test jobs and breaking-change notifications use @test-gb300, with the debug test container updated.
C++ test timeout ci/test_cpp.sh	The gtest execution timeout increases from 15 minutes to 30 minutes while preserving exit-code handling.

Estimated code review effort: 2 (Simple) | ~10 minutes

Possibly related PRs

• rapidsai/rmm#2492: Adds and wires a similar publish-api-docs workflow job.

Suggested labels: ci, improvement

Suggested reviewers: gforsyth, jameslamb

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title clearly matches the main change: switching workflows to test GB300 runners.
Description check	✅ Passed	The description is directly related to the workflow updates and GB300 runner testing.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.

✨ Finishing Touches 💡 1

🛠️ Fix failing CI checks 💡

• Fix failing CI checks

📝 Generate docstrings

• Create stacked PR
• Commit on current branch

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch test-gb300

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[KyleFromNVIDIA]

/ok to test f2d06f3

[KyleFromNVIDIA]

/ok to test e15b27b

[KyleFromNVIDIA]

/ok to test 080466e