[CI] Copy /etc/ceph output to logs

Change-Id: I91317c7d4972f07f741cdde2f406e290bb65467b
diff --git a/.zuul.yaml b/.zuul.yaml
index d387b0d..ec827c2 100644
--- a/.zuul.yaml
+++ b/.zuul.yaml
@@ -340,6 +340,7 @@
         '{{ stage_dir }}/listen53.txt': logs
         '{{ stage_dir }}/deprecations.log': logs
         '{{ stage_dir }}/audit.log': logs
+        /etc/ceph: logs
         /var/log/ceph: logs
         /var/log/openvswitch: logs
         /var/log/glusterfs: logs