CI: upload tests-junit.xml as a normal artifact too

This allows checking the file if gitlab can't parse it for some reason.

Signed-off-by: Marek Marczykowski-Górecki <marmarek@invisiblethingslab.com>
Acked-by: Stefano Stabellini <sstabellini@kernel.org>

automation/gitlab-ci/test.yaml

@@ -151,6 +151,7 @@
     paths:
       - smoke.serial
       - '*.log'
+      - tests-junit.xml
     when: always
   rules:
     - if: $CI_JOB_NAME =~ $SELECTED_JOBS_ONLY && $QUBES_JOBS == "true"