ci: Attach batch.txt and batch.report on failures

batch.txt is not predictable (tests are run in file system order, not
asciibetically or otherwise reproducibly). To aid with local
reproduction, attach the generated batch file to the test artifact.

Author: martinpitt

.github/workflows/qemu-kvm-integration-tests.yml

@@ -114,7 +114,10 @@ jobs:
         uses: actions/upload-artifact@v4
         with:
           name: "logs-${{ matrix.scenario.image }}-${{ matrix.scenario.env }}"
-          path: tests/*.log
+          path: |
+            tests/*.log
+            batch.txt
+            batch.report
           retention-days: 30
 
       - name: Show test log failures