allow for always_copy

[warnerwarner]

Problem description

Hi, I've been trying to set up pixi environments on a ExFAT formatted SSD and running into trouble because symbolic links arent supported. I think that this might be fixable by exposing Rattler's always_copy option somewhere in a pixi.toml or config.toml?

[Hofer-Julian]

On which platform did you run into problems? Is this happening across file systems?

[Hofer-Julian]

What is the exact error message you get?