Mark GitHub releases as latest

[p5]

Please could you mark releases as "latest" (i.e. non pre-release) since this is messing with some automation in various repositories.
It's generally bad practice to use pre-release binaries in production, so therefore a lot of tooling is built to exclude these packages from automated updates and for selection during builds.

I know next to nothing about goreleaser, however I can see prerelease: true being set.
https://github.com/chainguard-dev/apko/blob/main/.goreleaser.yaml#L61

From reading older (closed) issues, there doesn't appear to be a real reason for these to be marked as pre-release, but please do let me know if there's a reason.