fix(ansible): Résolution violations linting YAML

Fixed yamllint errors and warnings across all Ansible files:
- Reformatted long lines to stay within 80 character limit
- Standardized boolean values to use true/false instead of yes/no
- Fixed YAML folding syntax for multiline strings
- Removed erroneous triple quotes in k3s-server tasks

This resolves all yamllint issues reported by the CI pipeline.

ansible/site.yml

@@ -9,7 +9,11 @@
 
   vars:
     # Read node role from file created by cloud-init
-    node_role: "{{ lookup('file', '/etc/node-role', errors='ignore') | default('undefined') }}"
+    node_role: >-
+      {{
+        lookup('file', '/etc/node-role', errors='ignore')
+        | default('undefined')
+      }}
 
   pre_tasks:
     - name: Display node information
@@ -20,11 +24,13 @@
       assert:
         that:
           - node_role in ['server', 'witness']
-        fail_msg: "Invalid node role: {{ node_role }}. Expected 'server' or 'witness'"
+        fail_msg: >-
+          Invalid node role: {{ node_role }}.
+          Expected 'server' or 'witness'
 
     - name: Update apt cache
       apt:
-        update_cache: yes
+        update_cache: true
         cache_valid_time: 3600
 
   roles:
@@ -42,4 +48,6 @@
   post_tasks:
     - name: Display completion message
       debug:
-        msg: "Configuration complete for {{ ansible_hostname }} ({{ node_role }})"
+        msg: >-
+          Configuration complete for
+          {{ ansible_hostname }} ({{ node_role }})