fix: keep pipeline pytest temp files off /tmp

[nightcityblade]

Description

For the CPU pipelines test shard, send pytest temporary files to $GITHUB_WORKSPACE/pytest-tmp instead of the runner's default /tmp. This keeps the Ray --temp-dir/pytest temp tree off the smaller /tmp partition and matches the workaround described in the issue.

Closes #1775.

Usage

# CI-only change: the pipelines shard now runs roughly like
# pytest tests/pipelines -m "not gpu" --basetemp="$GITHUB_WORKSPACE/pytest-tmp"

Checklist

• I am familiar with the Contributing Guide.
• New or Existing tests cover these changes.
• The documentation is up to date with these changes.

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[greptile-apps]

Greptile Summary

This PR adds a conditional branch in the cicd-cpu-tests job so that the pipelines matrix shard redirects pytest's temp tree (and the Ray --temp-dir derived from it) to $GITHUB_WORKSPACE/pytest-tmp instead of the default /tmp, preventing the smaller /tmp partition from filling up on runners that execute pipeline tests with Ray.

Confidence Score: 5/5

Safe to merge — minimal, targeted CI-only change with no impact on production code or test logic.

The change is a single conditional block in the CI workflow, correctly scoped to the pipelines shard, uses the well-established --basetemp pytest flag, and the mkdir -p guard prevents any race with pytest trying to create sub-directories. No P0/P1 issues identified.

No files require special attention.

Important Files Changed

Filename	Overview
.github/workflows/cicd-main.yml	Adds a conditional block for the pipelines shard that creates $GITHUB_WORKSPACE/pytest-tmp and passes --basetemp to pytest; all other shards are unchanged.

Flowchart

%%{init: {'theme': 'neutral'}}%%
flowchart TD
    A[cicd-cpu-tests matrix job\nfolder × python-version] --> B{FOLDER == 'pipelines'?}
    B -- yes --> C[mkdir -p\n$GITHUB_WORKSPACE/pytest-tmp]
    C --> D[coverage run ... pytest\n--basetemp=$GITHUB_WORKSPACE/pytest-tmp]
    D --> E[Temp files → workspace\nlarge partition]
    B -- no --> F[coverage run ... pytest\ndefault basetemp]
    F --> G[Temp files → /tmp\nsmall partition]

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