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 949bf82 and eda863d.

📒 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 for package installation.
• Dependency Configuration
  • Generated requirements for selected RAPIDS packages no longer include the nightly wheels index as an extra package source.

Walkthrough

The CUDA 12.9 and 13.3 pip devcontainers now set PIP_EXTRA_INDEX_URL to the RAPIDS nightly wheels index. Five dependency groups no longer add that index to requirements output.

Changes

Pip index configuration

Layer / File(s)	Summary
Configure nightly wheel index .devcontainer/cuda*-pip/devcontainer.json, dependencies.yaml	The CUDA 12.9 and 13.3 pip devcontainers set PIP_EXTRA_INDEX_URL. Five dependency groups remove the requirements-output extra index URL.

Priority: ⬇️ Low

Estimated code review effort: 1 (Trivial) | ~4 minutes

Change: Other

Merge Risk: ⚪ Minimal · up to eda86

The nightly index remains available in the supported devcontainer and CI install paths, so this change presents no actionable merge-blocking risk.

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title clearly summarizes the proxy-cache change and 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