fetch-sphinx-tarball: Do not keep owner of archived files

Since we cannot create users this causes an error if the user is not
the same on both the host that produced the files and the executor.

Change-Id: I74464033001666c82ccfa702799e9236029df816

roles/fetch-sphinx-tarball/tasks/html.yaml

@@ -28,6 +28,8 @@
     src: "{{ zuul.executor.log_root }}/docs-html.tar.bz2"
     dest: "{{ zuul.executor.log_root }}/docs"
     remote_src: true
+    extra_opts:
+      - "--no-same-owner"
 
 - name: Return artifact to Zuul
   zuul_return: