update default home directory

Signed-off-by: Jack <[email protected]>

roles/_common/tasks/install.yml

@@ -37,7 +37,7 @@
     system: true
     shell: "/usr/sbin/nologin"
     group: "{{ _common_system_group }}"
-    home: "{{ _common_config_dir | default('/') }}"
+    home: "{{ _common_config_dir | default('/') | ternary(_common_config_dir, '/') }}"
     create_home: false
   become: true
   when: _common_system_user not in ansible_facts.getent_passwd