Merge pull request #308816 from pwaller/julia

  # git config --global --add safe.directory '/nix'

  export JULIA_PKG_USE_CLI_GIT="true"

  # At time of writing, this appears to be the only way to turn precompiling's

  # terminal output into standard logging, so opportunistically do that.

  # (Note this is different from JULIA_CI).

  export CI=true

  julia -e ' \

    import Pkg

    import Pkg.Types: PRESERVE_NONE