chore: add CI workflow

[joaovjo]

Summary

• Add GitHub Actions CI workflow (bun test + biome lint)

Test plan

• Local: bun test + bun run lint green

Summary by CodeRabbit

• Chores
  • Added automated checks for pull requests and updates to the main branch.
  • CI now runs tests and linting in a consistent environment.
  • Redundant workflow runs are automatically canceled.

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[coderabbitai]

Caution

Review failed

The pull request is closed.

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: Organization UI

Review profile: CHILL

Plan: Pro Plus

Run ID: d422b699-3f10-4ce1-ac95-415589162ac6

📥 Commits

Reviewing files that changed from the base of the PR and between edb1b65 and 487a7a3.

📒 Files selected for processing (1)

• .github/workflows/ci.yml

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📝 Walkthrough

Walkthrough

The pull request adds a GitHub Actions workflow for pull requests and pushes to main. The workflow runs dependency installation, tests, and linting on Ubuntu with Bun.

Changes

CI workflow

Layer / File(s)	Summary
Workflow triggers and verification job .github/workflows/ci.yml	The workflow uses pull request and main push triggers, read-only content access, concurrency cancellation, Bun setup, frozen dependency installation, tests, and linting.

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

Poem

I’m a rabbit in the CI lane,
Checking every push and change.
Bun hops in, tests run bright,
Lint keeps the code clean and light.
Green checks dance beneath the moon.

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