ci: add HIP debug probes for DO runner#1399
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Pull request overview
This PR augments the atom-test GitHub Actions workflow with additional ROCm/HIP diagnostics specifically for the DigitalOcean MI350x-8 runner, aiming to surface early device/driver/runtime issues and retain debug artifacts for postmortem analysis when failures occur.
Changes:
- Adds a single-process HIP/PyTorch initialization probe inside the CI container (environment + device mapping + basic allocations).
- Adds a TP=4 distributed smoke test using
torch.distributedall-reduce to validate multi-GPU comms early. - Collects and uploads HIP/ROCm debug artifacts (logs, env snapshot, device nodes, rocm-smi outputs) on all outcomes for the targeted runner.
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