Update rocky 8 to raw

Author: JohnGarbutt

.github/workflows/fatimage.yml

@@ -23,7 +23,7 @@ jobs:
       matrix: # build RL8, RL9
         build:
           - image_name: openhpc-RL8
-            source_image_name: Rocky-8-GenericCloud-Base-8.10-20240528.0.x86_64.qcow2
+            source_image_name: Rocky-8-GenericCloud-Base-8.10-20240528.0.x86_64.raw
             inventory_groups: control,compute,login,update
           - image_name: openhpc-RL9
             source_image_name: Rocky-9-GenericCloud-Base-9.5-20241118.0.x86_64.raw