Update .github/workflows/overcloud-host-image-build.yml

Co-authored-by: Matt Anson <[email protected]>

Author: MaxBed4d

.github/workflows/overcloud-host-image-build.yml

@@ -21,7 +21,7 @@ on:
       cpu-platform-architecture:
         description: Select the image's build architecture
         type: choice
-        default: x86
+        default: x86_64
         options:
           - x86_64
           - aarch64