Fix llama stack build docker creation to have correct entrypoint

llama_stack/distribution/build.py

@@ -119,12 +119,15 @@ def build_image(
     normal_deps += SERVER_DEPENDENCIES
 
     if build_config.image_type == ImageType.container.value:
+        if not template_name:
+            raise ValueError("template_name is required for container builds")
+
         script = str(
             importlib.resources.files("llama_stack") / "distribution/build_container.sh"
         )
         args = [
             script,
-            image_name,
+            template_name,
             container_image,
             str(build_file_path),
             str(BUILDS_BASE_DIR / ImageType.container.value),