[Bug] GitHub Actions build task succeeds even when compilation fails

[andrebrait]

Describe the Bug

When running the GitHub Actions build flow, it succeeds even if it fails to compile and/or produce any artifacts.
I'm not sure whether that was intended.

Additional Context?

Example run: https://github.com/andrebrait/qmk_userspace/actions/runs/7771624531

[andrebrait]

I guess this actually belongs in https://github.com/qmk/.github, correct?

[tzarc]

I guess this actually belongs in qmk/.github, correct?

Eh, close enough here. Probably better visibility. Will have a look -- mine's failing too so at least I have a local repro.

[tzarc]

Fixed.