Add Noble to kolla-images.py

Author: Alex-Welsh

tools/kolla-images.py

@@ -99,7 +99,7 @@
 # List of supported base distributions and versions.
 SUPPORTED_BASE_DISTROS = [
     "rocky-9",
-    "ubuntu-jammy",
+    "ubuntu-noble",
 ]
 
 
@@ -230,7 +230,7 @@ def get_openstack_release() -> str:
         if key.strip() == "defaultbranch":
             value = value.strip()
             if value == "master":
-                return value
+                return value[:]
             for prefix in ("stable/", "unmaintained/"):
                 if value.startswith(prefix):
                     return value[len(prefix):]