NO-ISSUE Commit sig/**.rbs when code is updated by openapi generator

Author: Yang-33

.github/workflows/generate-code.yml

@@ -80,6 +80,7 @@ jobs:
 
           git add line-openapi
           git add lib/**
+          git add sig/**
           git commit -m "Codes are generated by openapi"
 
           git push origin $BRANCH_NAME