Copy the SparkR source package with LFTP

This PR adds a line in release-build.sh to copy the SparkR source archive using LFTP

Author: Shivaram Venkataraman <shivaram@cs.berkeley.edu>

Closes #16226 from shivaram/fix-sparkr-copy-build.

dev/create-release/release-build.sh

@@ -258,6 +258,7 @@ if [[ "$1" == "package" ]]; then
   LFTP mkdir -p $dest_dir
   LFTP mput -O $dest_dir 'spark-*'
   LFTP mput -O $dest_dir 'pyspark-*'
+  LFTP mput -O $dest_dir 'SparkR-*'
   exit 0
 fi