[jvm-packages] [CI] Create a Maven repository to host SNAPSHOT JARs (#5533)

tests/ci_build/deploy_jvm_packages.sh

@@ -0,0 +1,25 @@
+#!/bin/bash
+
+set -e
+set -x
+
+if [ $# -ne 1 ]; then
+  echo "Usage: $0 [spark version]"
+  exit 1
+fi
+
+spark_version=$1
+
+# Initialize local Maven repository
+./tests/ci_build/initialize_maven.sh
+
+rm -rf build/
+cd jvm-packages
+# re-build package without Mock Rabit
+mvn --no-transfer-progress package -Dspark.version=${spark_version} -DskipTests
+
+# deploy to S3 bucket xgboost-maven-repo
+mvn --no-transfer-progress deploy -P release-to-s3 -DskipTests
+
+set +x
+set +e