Set up GitHub Actions CI

[lvchenjia]

Description

Add a basic GitHub Actions CI workflow that builds the project on every push / PR to catch compilation errors early.

Tasks

• Create .github/workflows/ci.yml
• Use macos-14 runner (Apple Silicon)
• Use Xcode 15+ / Swift 5.9+
• Run swift build -c release
• Optionally run swift test once tests exist

Resources

• Example: https://docs.github.com/en/actions/use-cases-and-examples/building-and-testing/building-and-testing-swift

Testing

• Push the workflow file, verify the Action runs and passes on the main branch

[mazi-eth]

Can you please assign this to me

[mazi-eth]

I'm working on this

[lvchenjia]

Thanks! Looking forward to your pull request.