githubactions_diag.yml

- name: Double-check macOS version (${{ matrix.macos }})
  run: sw_vers
- name: Double-check Xcode.app selected
  run: xcode-select --print-path
- name: Check xcodebuild version
  run: xcodebuild -version
- name: Check xcode embedded SDKs
  run: xcodebuild -showsdks
- name: Show buildable schemes
  run: xcodebuild -list
- name: Show eligible build destinations for the ${{ matrix.scheme }}
  run: xcodebuild -showdestinations -scheme ${{ matrix.scheme }}