update nameserver playbook to setup for debian bullseye, and add new cubox to inventory

ansible-5/playbooks/bootstrap.yaml

@@ -1,6 +1,6 @@
 ---
 - name: bootstrap
-  hosts: cubox-m
+  hosts: managed
 #  remote_user: ansible
   gather_facts: false
 #  become: true
@@ -94,10 +94,14 @@
     - name: remove {{item}} user if it exists
       command: userdel -rf {{item}}
       become: true
-      become_user: ansible
       args:
         removes: /home/{{item}}/.bashrc
       loop:
         - debian
         - ubuntu
 
+    - name: fix bullseye-security
+      ansible.builtin.replace:
+        path: /etc/apt/sources.list
+        regexp: '(\s+)bullseye\/updates(\s+.*)?$'
+        replace: '\1bullseye-security\/updates\2'