feat: add pinning strategy to the configuration

[ruben-arts]

Improve UX for users that want a different pinning strategy in pixi add.

With this pr users can set the strategy they want:

• semver: 1.2.3 -> >=1.2.3, <2 and 0.1.0 -> >=0.1.0, <0.2 and 0.0.0 -> >=0.0.0, <0.0.1
• no-pin: 1.2.3 -> *
• exact-version: 1.2.3 -> ==1.2.3
• minor: 1.2.3 -> >=1.2.3, <1.3
• major: 1.2.3 -> >=1.2.3, <2
• latest-up: 1.2.3 -> >=1.2.3

Users can set it using pixi config set pinning-strategy no-pin.

The pixi add will show what it added to the toml file:

> pixi config set pinning-strategy exact-version
> pixi add starship
Added starship ==1.19.0

Closes #1562

[Hofer-Julian]

Looks good at first glance.
I've opened #1562 since I feel that pin-major should be the default.

[ruben-arts]

@Hofer-Julian it should now implement this. In another pr we can also add it to the cli.

I was thinking this might also be a project specific configuration setting. so maybe adding it to the manifest aswell? 🤔

[Hofer-Julian]

@Hofer-Julian it should now implement this. In another pr we can also add it to the cli.

I was thinking this might also be a project specific configuration setting. so maybe adding it to the manifest aswell? 🤔

Awesome, thanks @ruben-arts!
Being able to set the default in the manifest sounds good to me

[baszalmstra]

Cant you already have a pixi config local to the project? Similar to a .cargo/config.toml?

[ruben-arts]

Cant you already have a pixi config local to the project? Similar to a .cargo/config.toml?

Yes that is possible, was just a braindump as it might be a conflict prone file. But might not be that bad.

[Hofer-Julian]

Cant you already have a pixi config local to the project? Similar to a .cargo/config.toml?

Yes that is possible, was just a braindump as it might be a conflict prone file. But might not be that bad.

I actually wasn't aware of that one. In that case I'd prefer the config :)

[baszalmstra]

Would by nice if you can also have a pixi add --pinning-strategy ..!

[ruben-arts]

@baszalmstra, yes!, I would like to merge this first