Actions: macOS 15 is now available for GitHub-hosted runners (Preview)

[github-product-roadmap]

Summary

macOS 15 is now available in public beta for GitHub-hosted runners.

Intended Outcome

Apple developers require the latest version of macOS and Xcode now have access to newer versions

How will it work?

Update the runs-on: key in you workflow file to macos-15, macos-15-large, or macos-15-xlarge

jobs:
  build:
    runs-on: macos-15
    steps:
      - uses: actions/checkout@v4
      - name: Build
        run: swift build
      - name: Run tests
        run: swift test