run fatimage workflow on self-hosted runner

Author: bertiethorpe

.github/workflows/fatimage.yml

@@ -8,7 +8,7 @@ concurrency:
 jobs:
   openstack:
     name: openstack-imagebuild
-    runs-on: ubuntu-22.04
+    runs-on: self-hosted
     strategy:
       matrix:
         os_version: