Fix storing of matrix job output

Author: vmcj

.github/workflows/unit-tests.yml

@@ -73,7 +73,7 @@ jobs:
         if: ${{ !cancelled() }}
         uses: actions/upload-artifact@v4
         with:
-          name: Logs
+          name: Logs-${{ matrix.PHPVERSION }}-${{ matrix.TEST }}
           path: |
             /var/log/nginx
             /opt/domjudge/domserver/webapp/var/log/*.log