ci: initial work for migration-testing (#311)

Also generating new assets for new ci steps.

examples/o2m2types/ent/pet_query.go

@@ -323,7 +323,6 @@ func (pq *PetQuery) sqlAll(ctx context.Context) ([]*Pet, error) {
 	if err := sqlgraph.QueryNodes(ctx, pq.driver, _spec); err != nil {
 		return nil, err
 	}
-
 	if len(nodes) == 0 {
 		return nodes, nil
 	}

examples/o2m2types/ent/user_query.go

@@ -313,7 +313,6 @@ func (uq *UserQuery) sqlAll(ctx context.Context) ([]*User, error) {
 	if err := sqlgraph.QueryNodes(ctx, uq.driver, _spec); err != nil {
 		return nil, err
 	}
-
 	if len(nodes) == 0 {
 		return nodes, nil
 	}