[CI] Port CI fixes from the 1.2.0 branch (#6050)

* Fix a unit test on CLI, to handle RC versions

* [CI] Use mgpu machine to run gpu hist unit tests

* [CI] Build GPU-enabled JAR artifact and deploy to xgboost-maven-repo

tests/ci_build/deploy_jvm_packages.sh

@@ -3,22 +3,32 @@
 set -e
 set -x
 
-if [ $# -ne 1 ]; then
-  echo "Usage: $0 [spark version]"
+if [ $# -ne 2 ]; then
+  echo "Usage: $0 [spark version] [build_gpu? 0 or 1]"
   exit 1
 fi
 
 spark_version=$1
+build_gpu=$2
 
 # Initialize local Maven repository
 ./tests/ci_build/initialize_maven.sh
 
-rm -rf build/
 cd jvm-packages
+rm -rf $(find . -name target)
+rm -rf ../build/
 
 # Re-build package without Mock Rabit
 # Deploy to S3 bucket xgboost-maven-repo
-mvn --no-transfer-progress package deploy -P release-to-s3 -Dspark.version=${spark_version} -DskipTests
+if [[ "$build_gpu" == "0" ]]
+then
+  # Build CPU artifact
+  mvn --no-transfer-progress package deploy -P release-to-s3 -Dspark.version=${spark_version} -DskipTests
+else
+  # Build GPU artifact
+  sed -i -e 's/<artifactId>xgboost\(.*\)_\(.*\)<\/artifactId>/<artifactId>xgboost\1-gpu_\2<\/artifactId>/' $(find . -name pom.xml)
+  mvn --no-transfer-progress package deploy -Duse.cuda=ON -P release-to-s3 -Dspark.version=${spark_version} -DskipTests
+fi
 
 set +x
 set +e