fix: Move sentence-transformers to the top

Move sentence-transformers to be the first embedding in the
list of models. This ensures it will always be the default and
is more consistent then having the default change based on what
env variables are available

Closes: #2702

Signed-off-by: Derek Higgins <derekh@redhat.com>

llama_stack/templates/starter/run.yaml

@@ -256,6 +256,11 @@ inference_store:
   type: sqlite
   db_path: ${env.SQLITE_STORE_DIR:=~/.llama/distributions/starter}/inference_store.db
 models:
+- metadata:
+    embedding_dimension: 384
+  model_id: all-MiniLM-L6-v2
+  provider_id: ${env.ENABLE_SENTENCE_TRANSFORMERS:=sentence-transformers}
+  model_type: embedding
 - metadata: {}
   model_id: ${env.ENABLE_CEREBRAS:=__disabled__}/llama3.1-8b
   provider_id: ${env.ENABLE_CEREBRAS:=__disabled__}
@@ -1162,11 +1167,6 @@ models:
   provider_id: ${env.ENABLE_SAMBANOVA:=__disabled__}
   provider_model_id: sambanova/Meta-Llama-Guard-3-8B
   model_type: llm
-- metadata:
-    embedding_dimension: 384
-  model_id: all-MiniLM-L6-v2
-  provider_id: ${env.ENABLE_SENTENCE_TRANSFORMERS:=sentence-transformers}
-  model_type: embedding
 shields:
 - shield_id: ${env.ENABLE_OLLAMA:=__disabled__}
   provider_id: llama-guard

llama_stack/templates/starter/starter.py

@@ -380,7 +380,7 @@ def get_distribution_template() -> DistributionTemplate:
                     "files": [files_provider],
                     "post_training": [post_training_provider],
                 },
-                default_models=default_models + [embedding_model],
+                default_models=[embedding_model] + default_models,
                 default_tool_groups=default_tool_groups,
                 # TODO: add a way to enable/disable shields on the fly
                 default_shields=shields,