store: make ListQueue return value more predictable by sorting it

The return value hasn't been predictable prior to this commit. This is
probably caused by internal implementation of Golang map. This commit
fixes it by sorting the output.

internal/store/store.go

@@ -305,6 +305,11 @@ func (s *Store) ListQueue(uuids []uuid.UUID) []*ComposeEntry {
 		}
 	}
 
+	// make this function output more predictable
+	sort.Slice(composes, func(i, j int) bool {
+		return composes[i].ID.String() < composes[j].ID.String()
+	})
+
 	return composes
 }