Move disk image creation to osbuild.

Signed-off-by: Paul Whalen <pwhalen@redhat.com>

fedora-iot.conf

@@ -210,21 +210,20 @@ global_version = '38'
 # live_images ignores this in favor of live_target
 global_target = 'f38'
 
-image_build = {
-    '^IoT$': [
-        {
-            'image-build': {
-                    'format': [('raw-xz','raw.xz')],
-                    'name': 'Fedora-IoT',
-                    'kickstart': 'fedora-iot.ks',
-                    'distro': 'Fedora-30',
-                    'disk_size': 4,
-                    'arches': ['aarch64', 'x86_64'],
-                    'install_tree_from': "https://kojipkgs.fedoraproject.org/compose/rawhide/latest-Fedora-Rawhide/compose/Everything/$arch/os/",
-                    'subvariant': 'IoT',
-                     }
-        }
-        ],
+osbuild = {
+    "^IoT$": [
+      {
+        "name": "%s-disk-image" % release_name,
+        "version": "!OSTREE_VERSION_FROM_LABEL_DATE_TYPE_RESPIN",
+        "distro": "fedora-38",
+        "image_types": ["iot-raw-image"],
+        "target": "fedora-iot-%s" % release_version,
+        "arches": ["x86_64", "aarch64"],
+        "ostree_url": "https://kojipkgs.fedoraproject.org/compose/iot/repo/",
+        "ostree_ref": "fedora/rawhide/$arch/iot",
+        "subvariant": "IoT",
+      },
+ ],
 }
 
 ostree = [