fix NODE_ROLES file

bubble-server/src/main/java/bubble/service/packer/PackerService.java

@@ -29,7 +29,7 @@ public class PackerService {
     public static final List<String> SAGE_ROLES = splitAndTrim(stream2string(PACKER_DIR + "/sage-roles.txt"), "\n")
             .stream().filter(s -> !empty(s)).collect(Collectors.toList());
 
-    public static final List<String> NODE_ROLES = splitAndTrim(stream2string(PACKER_DIR + "/sage-roles.txt"), "\n")
+    public static final List<String> NODE_ROLES = splitAndTrim(stream2string(PACKER_DIR + "/node-roles.txt"), "\n")
             .stream().filter(s -> !empty(s)).collect(Collectors.toList());
 
     // todo: change packer-sage.json.hbs to packer.json.hbs, insert required roles via handlebars