Summary
Actions will add the ability to run your workflow jobs on the latest macOS version from Apple, Monterey. Apple is expected to release macOS Monterey this fall.

Intended Outcome
Run your Actions workflow jobs on the latest iteration of Apple's macOS platform.

How will it work
Update your workflow jobs to include runs-on: macos-12

jobs:
  build:
    runs-on: macos-12
    steps:
      - uses: actions/checkout@v2
      - name: Build
        run: swift build
      - name: Run tests
        run: swift test