Fetch rapids-cmake cmake-format with GitHub authentication

[bdice]

Description

This is a fix for the style check download failure observed in #2476: https://github.com/rapidsai/rmm/actions/runs/28987611693/job/86020175188

--2026-07-09 01:29:50--  https://raw.githubusercontent.com/rapidsai/rapids-cmake/main/cmake-format-rapids-cmake.json
Resolving raw.githubusercontent.com (raw.githubusercontent.com)... 185.199.111.133, 185.199.108.133, 185.199.109.133, ...
Connecting to raw.githubusercontent.com (raw.githubusercontent.com)|185.199.111.133|:443... connected.
HTTP request sent, awaiting response... 429 Too Many Requests
2026-07-09 01:29:53 ERROR 429: Too Many Requests.

This updates ci/check_style.sh to fetch cmake-format-rapids-cmake.json through the GitHub contents API with gh api when available. The existing unauthenticated wget download remains as the fallback.

Checklist

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

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: Path: .coderabbit.yaml

Review profile: CHILL

Plan: Enterprise

Run ID: d3aed3fa-f18e-45e5-8ff6-d4c25312b54c

📥 Commits

Reviewing files that changed from the base of the PR and between efea100 and 52830bc.

📒 Files selected for processing (1)

• ci/check_style.sh

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📝 Walkthrough

Summary by CodeRabbit

• Chores
  • Updated the project copyright year range to 2026.
  • Improved file retrieval in the style check process by using a more reliable download method, with a fallback if the primary approach is unavailable.
  • Made path handling more robust when preparing temporary directories.

Walkthrough

The ci/check_style.sh script's SPDX copyright year was extended to 2020–2026. The cmake-format-rapids-cmake.json retrieval logic was changed to attempt download via gh api with specific headers, falling back to wget if gh is unavailable or fails, with directory creation now using a quoted dirname.

Changes

CI style check script update

Layer / File(s)	Summary
cmake-format file retrieval with gh api fallback ci/check_style.sh	Adds a gh api download path for the cmake-format JSON with required headers, falls back to wget when gh is unavailable or fails, quotes the dirname used for directory creation, and updates the SPDX copyright year to 2020–2026.

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

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title clearly describes the main CI change to fetch rapids-cmake formatting config with GitHub authentication.
Description check	✅ Passed	The description matches the changeset and explains the style-check download fix and fallback behavior.
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

🧪 Generate unit tests (beta)

• Create PR with unit tests

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_{Comment @coderabbitai help to get the list of available commands.}

[vyasr]

If you can, please make this change in cudf (and other repos with this fetch in place) too. Thanks!