Add Rocky Linux 9.0

roles/netbootxyz/defaults/main.yml

@@ -418,6 +418,8 @@ releases:
     mirror: http://download.rockylinux.org
     name: Rocky Linux
     versions:
+    - code_name: 9.0
+      name: 9.0
     - code_name: 8.6
       name: 8.6
     - code_name: 8.5