https://github.com/actions/virtual-environments

Big Sur:

actions/runner-images#1814: macOS Big Sur (11.0) is available as a preview for GitHub Action users!

To use it set runs-on: macos-11.0 in your workflow file.

Details: https://github.com/actions/virtual-environments/blob/main/images/macos/macos-11.0-Readme.md

• 12.3 (beta) 12C5020f /Applications/Xcode_12.3.app
• 12.2 12B5044c /Applications/Xcode_12.2.app
• 11.7 (default) 11E801a /Applications/Xcode_11.7.app

Catalina: https://github.com/actions/virtual-environments/blob/main/images/macos/macos-10.15-Readme.md

• 12.3 (beta) 12C5020f /Applications/Xcode_12.3.app
• 12.2 12B45b /Applications/Xcode_12.2.app
• 12.1.1 12A7605b /Applications/Xcode_12.1.1.app
• 12.1 12A7403 /Applications/Xcode_12.1.app
• 12.0.1 (default) 12A7300 /Applications/Xcode_12.app
• 11.7 11E801a /Applications/Xcode_11.7.app

Previous update: #30487 - which added testing with Xcode 12 on Catalina.

See also: #30726 GH Actions: Test optional/experimental packages with Xcode 12

CC: @jhpalmieri @dimpase

Component: porting

Author: Matthias Koeppe

Branch/Commit: 7ae8cf1

Reviewer: Jonathan Kliem

Issue created by migration from https://trac.sagemath.org/ticket/30929