[jvm-packages] [CI] Publish XGBoost4J JARs with Scala 2.11 and 2.12

tests/ci_build/deploy_jvm_packages.sh

@@ -21,5 +21,12 @@ mvn --no-transfer-progress package -Dspark.version=${spark_version} -DskipTests
 # deploy to S3 bucket xgboost-maven-repo
 mvn --no-transfer-progress deploy -P release-to-s3 -DskipTests
 
+# Compile XGBoost4J with Scala 2.11 too
+mvn clean
+sed -i -e 's/<artifactId>xgboost\(.*\)_[0-9\.]\+/<artifactId>xgboost\1_2.11/' $(find . -name pom.xml)
+  # Rename artifactId of all XGBoost4J packages with suffix _2.11
+mvn package -Dspark.version=2.4.3 -Dscala.version=2.11.12 -Dscala.binary.version=2.11 -DskipTests
+mvn --no-transfer-progress deploy -P release-to-s3 -DskipTests
+
 set +x
 set +e