chore(sandbox): add GitHub CLI to Dockerfile

[vinodmut]

Summary

• Adds gh (GitHub CLI) to the sandbox Dockerfile from GitHub's official apt repository
• Enables sandbox users to interact with GitHub PRs, issues, and repos from within the container

Test plan

• Build the Docker image: docker build -t evolve-sandbox sandbox/
• Verify gh --version works inside the container

Summary by CodeRabbit

• Chores
  • GitHub CLI is now available in the sandbox environment.

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro

Run ID: e003e320-b188-4fa6-85d8-314f0a311507

📥 Commits

Reviewing files that changed from the base of the PR and between 034de13 and 3664c6e.

📒 Files selected for processing (1)

• sandbox/Dockerfile

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📝 Walkthrough

Walkthrough

The sandbox Dockerfile has been updated to add GitHub CLI installation by incorporating the official GitHub APT repository, downloading its signing key, updating the package list, and installing the gh package.

Changes

Cohort / File(s)	Summary
GitHub CLI Installation sandbox/Dockerfile	Added GitHub CLI repository setup with signing key download and APT source configuration, followed by apt-get update and installation of the gh package.

Estimated code review effort

🎯 1 (Trivial) | ⏱️ ~3 minutes

Suggested reviewers

• illeatmyhat
• visahak

Poem

🐰 A sandbox grows with CLI might,
Where GitHub's gh commands take flight,
With keys and repos properly signed,
Development tools now aligned!
✨

🚥 Pre-merge checks | ✅ 3

✅ Passed checks (3 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title clearly and concisely describes the main change: adding GitHub CLI to the Dockerfile in the sandbox directory.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.

_{✏️ Tip: You can configure your own custom pre-merge checks in the settings.}

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests

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