ci: use proxy cache for pypi.anaconda.org, remove pip indices from dependencies.yaml

[jameslamb]

Contributes to rapidsai/build-planning#338

Enables NVIDIA's self-hosted pull-through proxy cache for pypi.anaconda.org. See the linked issue for benefits of doing that.

• removes --extra-index-url pointing at nightly index from dependencies.yaml (already set globally in CI images)
• sets PIP_EXTRA_INDEX_URL explicitly in pip devcontainers (so it doesn't need to rely on values from dependencies.yaml)

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📥 Commits

Reviewing files that changed from the base of the PR and between 2677357 and 8cc5f29.

📒 Files selected for processing (3)

• .devcontainer/cuda12.9-pip/devcontainer.json
• .devcontainer/cuda13.3-pip/devcontainer.json
• dependencies.yaml

💤 Files with no reviewable changes (1)

• dependencies.yaml

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📝 Summary

Summary by CodeRabbit

• Development Environment
  • CUDA 12.9 and CUDA 13.3 pip development containers now use the RAPIDS nightly wheels index.
  • Dependency configurations no longer specify the nightly wheels index; package and CUDA version selections remain unchanged.

Walkthrough

The CUDA 12.9 and CUDA 13.3 pip devcontainers now configure the RAPIDS nightly wheels index. Six dependency declarations no longer include separate extra-index entries.

Changes

RAPIDS nightly pip index configuration

Layer / File(s)	Summary
Configure pip index and dependency declarations .devcontainer/cuda12.9-pip/devcontainer.json, .devcontainer/cuda13.3-pip/devcontainer.json, dependencies.yaml	Both devcontainers set PIP_EXTRA_INDEX_URL to the RAPIDS nightly wheels index. Six dependency declarations omit their extra-index entries; their package selections remain unchanged.

Priority: ⬇️ Low

Estimated code review effort: 2 (Simple) | ~5 minutes

Change: Other

Merge Risk: ⚪ Minimal · up to 8cc5f

The CI wheel image and both pip devcontainers retain access to the RAPIDS nightly index, so the index configuration change appears ready to merge.

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title clearly states the proxy-cache change and the removal of pip indices from dependencies.yaml.
Description check	✅ Passed	The description explains the proxy-cache objective and the related changes to dependencies.yaml and pip devcontainers.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check. Docstring coverage is scoped to functions touched by this diff. Analyzed 0 functions across 0…
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.

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[jameslamb]

/merge