ci: Support running from a worktree #30028

1. 
   maflcko commented at 8:59 am on May 3, 2024: member

   Currently, when running the CI from a worktree, it will fail with:

   0++ git config --global ci.base-install-done
   1fatal: not a git repository: .git/worktrees/test2
   

   git config --global is used here, because it allows to write a flag to storage on macOS and Linux. If someone knows of a different way to persist a flag on macOS and Linux, it should be used instead.

2. maflcko added the label Tests on May 3, 2024
3. 
   maflcko commented at 2:31 pm on May 3, 2024: member

   I guess macos can just be skipped, as it will never run the base-install twice, so doesn’t need caching.

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