refactor(users): change system.users from list to dict keyed by username

roles/global_defaults/tasks/main.yml

@@ -81,10 +81,12 @@
   when:
     - system_cfg.type == "virtual"
     - hypervisor_type != "vmware"
+  vars:
+    _primary: "{{ (system_cfg.users | dict2items | selectattr('value.password', 'defined') | first) }}"
   ansible.builtin.set_fact:
-    ansible_user: "{{ system_cfg.users[0].name }}"
-    ansible_password: "{{ system_cfg.users[0].password }}"
-    ansible_become_password: "{{ system_cfg.users[0].password }}"
+    ansible_user: "{{ _primary.key }}"
+    ansible_password: "{{ _primary.value.password }}"
+    ansible_become_password: "{{ _primary.value.password }}"
     ansible_ssh_extra_args: "-o UserKnownHostsFile=/dev/null -o StrictHostKeyChecking=no"
   no_log: true