fix: update preflight checks to ensure 'snippets' is included in Proxmox storage content list

tasks/preflight-checks.yml

@@ -168,16 +168,20 @@
       set_fact:
         storage_cfg: "{{ storage_cfg_raw.content | b64decode }}"
 
-    - name: "[PREFLIGHT] Add 'snippets' to storage content list if missing"
+    - name: "[PREFLIGHT] Get current content list of the target storage"
+      ansible.builtin.shell: >
+        awk '/^dir: {{ proxmox_snippets_storage }}/,/^$/' /etc/pve/storage.cfg |
+        awk '/content/ {print $3}'
+      register: current_content
+      changed_when: false
+
+    - name: "[PREFLIGHT] Ensure 'snippets' is in the content list"
       ansible.builtin.replace:
         path: /etc/pve/storage.cfg
-        regexp: "(?m)(^storage {{ proxmox_snippets_storage }}.*?content\\s*=\\s*)([^\n]+)"
-        replace: >-
-          \1{{ ( '\2'.split(',') | union(['snippets']) ) | join(',') }}
-      when:
-        - storage_cfg is search("storage " + proxmox_snippets_storage)
-        - storage_cfg is search("storage " + proxmox_snippets_storage + ".*content=")
-
+        regexp: "(?m)(^dir: {{ proxmox_snippets_storage }}[\\s\\S]*?content\\s*=\\s*)([^\\n]+)"
+        replace: "\\1{{ (current_content.stdout.split(',') | union(['snippets'])) | join(',') }}"
+      when: current_content.stdout != ""
+        
     - name: "[PREFLIGHT] Ensure snippets storage exists"
       ansible.builtin.file:
         path: "{{ proxmox_snippets_storage_path }}/snippets"