automation: collect log files in subdirectories

The current single *.log pattern collects just config.log, which
usually contains little useful information.
Collect also log files in subdirectories, tools/config.log usually
contains information about configure failures.

Signed-off-by: Olaf Hering <olaf@aepfle.de>
Acked-by: Andrew Cooper <andrew.cooper3@citrix.com>

automation/gitlab-ci/build.yaml

@@ -8,6 +8,7 @@
       - binaries/
       - xen-config
       - '*.log'
+      - '*/*.log'
     when: always
   except:
     - master