Change default to "latest"

[charliermarsh]

Summary

Also did some light editing of the README.

[charliermarsh]

@eifinger -- Anything else that I'm missing here?

[henryiii]

Does this do less caching? From what I understood, using a fixed version would cache uv. Before it was fixed based on the version of this action?

[eifinger]

The changes look good. It was missing to remove the "automatic" default version upgrade but I think that is better placed in a separate PR: #39

We should also clearly communicate this breaking change in the release note for existing users of this action. (added the breaking-change label to this PR)

[eifinger]

Does this do less caching? From what I understood, using a fixed version would cache uv. Before it was fixed based on the version of this action?

Yes, but only for self-hosted runners. See the added note in the readme:

https://github.com/astral-sh/setup-uv/pull/37/files#diff-b335630551682c19a781afebcf4d07bf978fb1f8ac04c6bf87428ed5106870f5R38-R40

On GitHub hosted runners we always download uv since there is no persistent TOOL_CACHE.

[charliermarsh]

I think we can also do a bit more work to improve the caching if it's impactful for self-hosted users (it's still <1s on GitHub Runners as-is): #45

[zanieb]

When we release this, should it be as v2?

[charliermarsh]

Works for me!