GHA annotation truncates runner names confusingly (?)

[maxheld83]

When a build fails, it appears that the annotation truncates the runner name:

[DeterminateCI / build (x86_64-darwin, macos-latest)](https://github.com/dataheld/nullkomma/actions/runs/13772723460/job/38514945376)
-The job was canceled because "x86_64-linux_ubuntu-lates" failed.
+The job was canceled because "x86_64-linux_ubuntu-latest" failed.

Diff highlights what the correct runner name should be.
Screenshot below in the details.

It seems like a small thing, but it led me on a goose chase 🪿 searching for a typo in my runners as the cause of the build fail (when really, the build failed for entirely unrelated reasons).

I don't know how this repo could even cause this truncation, so I apologize for logging this in the wrong place.

My guess would be that this string is created by flake-iter here:

https://github.com/DeterminateSystems/flake-iter/blob/a193bafe3a6b294cf2f5e1f38415784f9b6e631f/src/cmd/build.rs#L89

But I have no clue why or where that would be truncated to the above string.

Details