Add --prepend option for pixi project channel add

[scottamain]

Problem description

Using pixi project channel add adds the given channel name to the end of the project channels list, making it the lowest priority channel. That is, pixi project channel add pytorch gives me this:

[project]
channels = ["conda-forge", "pytorch"]

In some cases, it's necessary to make the new channel the highest priority. Currently, the only way to control the channel priority is to manually edit the pixi.toml file.

I think it would be fantastic if I could instead run:

pixi project channel add pytorch --prepend

And then get this:

[project]
channels = ["pytorch", "conda-forge"]

Thank you for your consideration! 🙏

[ruben-arts]

Great request! We're open to PR's this shouldn't be to hard!

[mrswastik-robot]

hey @ruben-arts , can I look into this issue ?

[ruben-arts]

@mrswastik-robot ofcourse!

[scottamain]

Hmm... Could you instead make prepend the default behavior (and add an --append option)?

I find it hard to imagine that most users use pixi project channel add only "just in case" the existing channels don't have a package.