Make Julia env copying robust against read-only scenarios #12895
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I noticed that I got failures on this line when using
quarto_jllin Julia to run quarto. This happens becausecopyFileSynccopies permissions of the source file as well, and all jlls in Julia have their source files under read-only permissions. This causes the Project.toml in the quarto cache directory to become read-only as well, which will make the next server startup fail because quarto attempts to overwrite the file.