ci: Migrate to uv and slash CI time by 55%

[abstract-333]

📝 Summary

This PR optimizes the CI test workflow by migrating dependency installation from pip to uv and implementing a more efficient caching strategy.

In previous versions, dependency caching with pip was not working properly. As a result, all dependencies were installed from scratch on every CI run, which significantly increased the workflow runtime.

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🛠️ Changes

🛡 Zero Breaking Changes

• No environment changes — requirements.txt and setup.py remain untouched.
• The optimization only affects the CI workflow configuration.

Core Action Upgrades

• actions/checkout@v4 → v6
• actions/setup-python@v5 → v6

Dependency Management

• Added astral-sh/setup-uv@v7 (pinned to 0.10.7)

CI Cache Optimization

• Enabled dependency caching for CI test requirements.
• Removed torch and torchvision from .github/requirements-test.txt to:
  • avoid duplicate downloads
  • prevent large cache artifacts
  • keep cache restores fast and lightweight.

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⚡ Performance Impact

Phase	Before (pip)	After (uv)	Improvement
Total Runtime	1m 30s	40s	-55% 🚀
Cache Restore	~25s	~3s	-88%
Cache Size	~400 MB	14 MB	-96%

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🧪 Verification

• Style check (make style)
• Quality check (make quality)
• License check (make license)
• Pytest suite completed successfully

⏱ Workflow execution time: ~40 seconds
🔗 GitHub Actions run:
https://github.com/abstract-333/EasyR1/actions/runs/22881238873

[gemini-code-assist]

Summary of Changes

Hello, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request significantly enhances the efficiency of the continuous integration pipeline. By transitioning from pip to uv for dependency management and implementing a robust caching mechanism, the CI workflow's total runtime has been drastically reduced, leading to faster feedback cycles and more streamlined development.

Highlights

• CI Performance Improvement: Migrated dependency installation from pip to uv in the CI workflow, resulting in a 55% reduction in total runtime.
• Dependency Caching Optimization: Implemented an efficient caching strategy for CI test requirements, reducing cache restore time by 88% and cache size by 96%.
• Core Action Upgrades: Updated GitHub Actions for checkout and setup-python to their latest major versions (v6).
• Test Requirements Refinement: Removed torch and torchvision from .github/requirements-test.txt to prevent duplicate downloads and optimize cache artifacts.

Changelog

• .github/requirements-test.txt
  • Removed torch and torchvision from the test requirements.

Ignored Files

• Ignored by pattern: .github/workflows/** (1)
  • .github/workflows/tests.yml

Activity

• The author has verified the changes by successfully running style, quality, license, and pytest checks.
• A GitHub Actions run confirmed the workflow execution time of approximately 40 seconds.

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[gemini-code-assist]

Code Review

This pull request migrates the CI from pip to uv, which significantly improves performance by optimizing dependency installation and caching. The changes involve updating GitHub Actions and removing torch and torchvision from the test requirements. My review focuses on further improving dependency management in .github/requirements-test.txt for better maintainability. I've suggested removing a redundant dependency, which also resolves a minor formatting issue.

_{Note: Security Review has been skipped due to the limited scope of the PR.}