Fix unit tests error paths.

.github/workflows/unit.yml

@@ -29,12 +29,12 @@ jobs:
     - name: Run unit tests
       # Use --symlink to limit disk usage.
       run: >- 
-        pytest --keep-workflow-wd --git-aware --tag ${{ matrix.test }} 
+        pytest --keep-workflow-wd-on-fail --git-aware --tag ${{ matrix.test }} 
         --symlink tests/ --basetemp ~/temp
     - name: Check miniwdl log in case of failure.
       if: ${{ failure() }}
       # Get the last 1000 lines of the miniwdl log to catch the error.
-      run: bash -c 'tail -n 1000 /home/runner/temp/*/log.out'
+      run: bash -c 'tail -n 1000 /home/runner/temp/*/task.out'
     - name: Check job stderr messages in case of failure
       if: ${{ failure() }}
       run: >-