message: tar checkpoints less often.
diff: @@ -16,6 +16,6 @@ elif [[ $TRAVIS_OS_NAME == "linux" ]]
  then
  AWS_ACCESS_KEY_ID=${GOOGLE_ACCESS_KEY_ID} AWS_SECRET_ACCESS_KEY=${GOOGLE_SECRET_ACCESS_KEY} aws s3 --endpoint-url https://storage.googleapis.com cp s3://cesium-unreal-engine/linux-2021-04-23/UnrealEngine-4.26.2.tar.gz .
  mkdir $HOME/UE_4.26
  - tar --checkpoint -xzf UnrealEngine-4.26.2.tar.gz -C $HOME/UE_4.26
  + tar --checkpoint=100000 -xzf UnrealEngine-4.26.2.tar.gz -C $HOME/UE_4.26
  rm UnrealEngine-4.26.2.tar.gz
  fi
  