Explicitely pass RSYNC_PASSWORD when uploading logs to ci.c.o artifacts

The rdo-jenkins.ci.centos.org jenkins slave has an implicit export
of RSYNC_PASSWORD located in .bash_profile which is sourced when
spawning a new shell.
However, this variable is already available and configured on the
jenkins slave (in the ci.c.o web interface).

When setting up and testing new slaves without that .bash_profile
export, the RSYNC_PASSWORD variable was not available in that context.
The RSYNC_PASSWORD variable is available on the machine running Ansible,
the jenkins slave, but not the duffy node.

We noticed the issue when weirdo jobs would be able to upload
artifacts while the quickstart jobs failed.

Change-Id: I6aababdf48fe8a5b19acaecb1b8427a68591973f

tasks/main.yml

@@ -186,7 +186,9 @@
       when: artcl_rsync_logs|bool and artcl_rsync_use_daemon == false
 
     #centos-ci
-    - name: upload to the artifact server using pubkey auth
+    - name: upload to the artifact server using password auth
+      environment:
+        RSYNC_PASSWORD: "{{ lookup('env', 'RSYNC_PASSWORD') }}"
       shell: >
         rsync -av {{ artcl_collect_dir }}/ {{ artcl_rsync_path }}/$BUILD_TAG
       retries: 5