added failure condition to the unit test ouptut step

Signed-off-by: Savvas Kyriacou <[email protected]>

.github/workflows/pr-build.yaml

@@ -50,6 +50,7 @@ jobs:
           --info
       
       - name: Upload test output as artifact
+        if: failure()
         uses: actions/upload-artifact@v3
         with:
           name: unit-tests