CI tests are crashing and nobody noticed

[LinqLover]

https://github.com/squeak-smalltalk/squeak-app/actions/runs/17114908960/job/48544405955#step:6:221

  vvvvvvvvvvvvvvvvvv Error: Computation has been terminated! vvvvvvvvvvvvvvvvvv
  The time is 2025-08-21T02:09:57.552811+00:00
  Context(Object)>>error:
  Context>>cannotReturn:
  FullBlockClosure(BlockClosure)>>ensure:
  [] in Context>>handleSignal:
  
  ^^^^^^^^^^^^^^^^^^ Error: Computation has been terminated! ^^^^^^^^^^^^^^^^^^

Maybe we should at least turn the job red if the CI fails to exit normally. Perhaps smalltalkCI offers a separate exit code for this (or could do so), I haven't checked yet.