Added the ability, to set the broadcast_websocket_secret variable.

This is nessesary if you would like to rerun the playbook.

Signed-off-by: JoelKle <34544090+JoelKle@users.noreply.github.com>

installer/roles/local_docker/tasks/main.yml

@@ -4,6 +4,7 @@
     broadcast_websocket_secret: "{{ lookup('password', '/dev/null', length=128) }}"
   run_once: true
   no_log: true
+  when: broadcast_websocket_secret is not defined
 
 - import_tasks: upgrade_postgres.yml
   when: