Address string issue in Groovy (opensearch-project#646)

Signed-off-by: Ian Hoang <ianhoang16@gmail.com>

Author: IanHoang

jenkins/release.JenkinsFile

@@ -17,10 +17,10 @@ standardReleasePipelineWithGenericTrigger(
             string(name: 'DOCKER_BUILD_GIT_REPOSITORY', value: 'https://github.com/opensearch-project/opensearch-build'),
             string(name: 'DOCKER_BUILD_GIT_REPOSITORY_REFERENCE', value: 'main'),
             string(name: 'DOCKER_BUILD_SCRIPT_WITH_COMMANDS', value: [
-                "su $(id -un 1000) -c \"cd docker/ci",
-                "git clone https://github.com/opensearch-project/opensearch-benchmark --branch ${tag} --single-branch opensearch-benchmark",
-                "cp -a opensearch-benchmark/* ./\"",
-                "cd docker/ci",
+                'su $(id -un 1000) -c "cd docker/ci',
+                "git clone https://github.com/opensearch-project/opensearch-benchmark --single-branch --branch ${tag} opensearch-benchmark",
+                'cp -a opensearch-benchmark/* ./"',
+                'cd docker/ci',
                 [
                     'bash',
                     'build-image-multi-arch.sh',