fix(environment): pick the largest cdrom as the RHEL install DVD

roles/environment/tasks/_prepare_installer.yml

@@ -73,28 +73,25 @@
         mode: "0755"
 
     - name: Detect RHEL ISO device
-      ansible.builtin.command: lsblk -rno NAME,TYPE
+      ansible.builtin.command: lsblk -rbno NAME,TYPE,SIZE
       register: environment_lsblk_result
       changed_when: false
 
     - name: Select RHEL ISO device
       vars:
-        _rom_devices: >-
-          {{
-            environment_lsblk_result.stdout_lines
-            | map('split', ' ')
-            | selectattr('1', 'equalto', 'rom')
-            | map('first')
-            | map('regex_replace', '^', '/dev/')
-            | list
-          }}
+        _roms: >-
+          {%- set out = [] -%}
+          {%- for line in environment_lsblk_result.stdout_lines -%}
+          {%-   set p = line.split() -%}
+          {%-   if (p | length) >= 3 and p[1] == 'rom' -%}
+          {%-     set _ = out.append({'name': p[0], 'size': p[2] | int}) -%}
+          {%-   endif -%}
+          {%- endfor -%}
+          {{ out }}
       ansible.builtin.set_fact:
         environment_rhel_iso_device: >-
-          {{
-            _rom_devices[-1]
-            if _rom_devices | length > 1
-            else (_rom_devices[0] | default('/dev/sr1'))
-          }}
+          {{ ('/dev/' ~ (_roms | sort(attribute='size') | last).name)
+             if (_roms | length) > 0 else '/dev/sr1' }}
 
     - name: Mount RHEL ISO
       ansible.posix.mount: