resultsdb: create the resultsdb's rabbitmq user

Signed-off-by: Pierre-Yves Chibon <pingou@pingoured.fr>

playbooks/groups/resultsdb.yml

@@ -32,6 +32,10 @@
    - { role: fedmsg/base,
        when: deployment_type != "dev" }
    - { role: dnf-automatic, tags: ['dnfautomatic'] }
+   # Set up for fedora-messaging
+   - { role: rabbit/user,
+       username: "resultsdb{{ env_suffix }}",
+       when: deployment_type == "stg" }
 
   tasks:
   # this is how you include other task lists