feat ✨: Add new task to gather memory facts and update RAM calculation

This commit introduces a new feature that adds a task specifically designed to gather memory-related facts. Additionally, it updates the RAM calculation logic to ensure accuracy based on the newly gathered data.

tasks/ram.yml

@@ -4,10 +4,13 @@
     that: ansible_os_family == "Debian"
     fail_msg: "This role only supports Debian/Proxmox systems."
 
+- name: Gather only memory fact
+  ansible.builtin.setup:
+    filter: ansible_memtotal_mb
+
 - name: ram | Calculate log2ram size
   ansible.builtin.set_fact:
-    _total_ram_mb: "{{ ansible_memtotal_mb }}"
-    _calculated_size_mb: "{{ (_total_ram_mb * log2ram_ram_percent / 100) | int }}"
+    _calculated_size_mb: "{{ (ansible_memtotal_mb * log2ram_ram_percent / 100) | int }}"
     log2ram_size_mb: >-
       {{
         [log2ram_min_size_mb,