chore: snapshot workflow migration progress

backend/app/models/output_type.py

@@ -2,6 +2,7 @@
 from app.domains.rendering.models import (
     OUTPUT_TYPE_ARTIFACT_KINDS,
     OUTPUT_TYPE_WORKFLOW_FAMILIES,
+    OUTPUT_TYPE_WORKFLOW_ROLLOUT_MODES,
     OutputType,
     VALID_RENDER_BACKENDS,
 )
@@ -9,5 +10,6 @@ __all__ = [
     "OutputType",
     "VALID_RENDER_BACKENDS",
     "OUTPUT_TYPE_WORKFLOW_FAMILIES",
+    "OUTPUT_TYPE_WORKFLOW_ROLLOUT_MODES",
     "OUTPUT_TYPE_ARTIFACT_KINDS",
 ]