Collect apache logs from gitea99 host in testing

We want to ensure that the logging apache does for us is sufficient to
trace requests from the load balancer to apache to gitea. To do that we
need to gather the logs and look at them.

Change-Id: I468d37709c1a3c2255b1bfcf38a23bb1a2a75899

zuul.d/system-config-run.yaml

@@ -616,6 +616,7 @@
           '/var/gitea/conf': logs
           '/var/gitea/certs': logs
           '/var/gitea/logs': logs
+          '/var/log/apache2': logs
       gitea-lb01.opendev.org:
         host_copy_output:
           '/var/haproxy/etc': logs