`./configure` should set `profile = "user"` by default

[jyn514]

This is part of https://jyn.dev/2023/01/12/Bootstrapping-Rust-in-2023.html that's not a breaking change. Setting profile = "user" will be useful regardless of the rest of the changes mentioned there, since it will let us change the global defaults in bootstrap without impacting distros as much.

This is blocked on #107049. Note that ./configure --set profile=x should override the default of user.

I would like to also set download-ci-rustc = false in src/bootstrap/defaults/config.user.toml at the same time.

[reez12g]

Is this an Issue that should be tackled after #107049 is completed?

[jyn514]

Yes, fixing this requires fixing the other first.

[reez12g]

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[lionellloh]

@reez12g Hey Rento, are you still interested in working on this? I was working on issue 107049, and I think this is a natural extension of it. Would you might if I take over this issue? Otherwise, no pressure!

[reez12g]

@lionellloh
I was still going to work on it, but if you can do it as a natural extension of your work, you are welcome to do it!

[lionellloh]

@lionellloh I was still going to work on it, but if you can do it as a natural extension of your work, you are welcome to do it!

Cool, thanks for your understanding. I will put a PR after #108229 is merged in.

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