Run R check as cran on action. [skip ci] (#6371)
Run R check as cran on action. [skip ci] (#6371)



Co-authored-by: Philip Hyunsu Cho <903e48286e90a304a3d0c6a4a8c068e5cdc6de90@cs.washington.edu>
dmlc/xgboost,dmlc/xgboost,dmlc/xgboost,dmlc/xgboost,dmlc/xgboost,dmlc/xgboost