configure git global user information

Former-commit-id: a9a17182a1fa22411c7a3bf0c7bb0505550cb333

ci/jenkinsfile/milvus_build.groovy

@@ -5,6 +5,8 @@ container('milvus-build-env') {
                 try {
                     checkout([$class: 'GitSCM', branches: [[name: "${SEMVER}"]], doGenerateSubmoduleConfigurations: false, extensions: [[$class: 'SubmoduleOption',disableSubmodules: false,parentCredentials: true,recursiveSubmodules: true,reference: '',trackingSubmodules: false]], submoduleCfg: [], userRemoteConfigs: [[credentialsId: "${params.GIT_USER}", url: "git@192.168.1.105:megasearch/milvus.git"]]])
                     dir ("cpp") {
+                        sh "git config --global user.email \"test@zilliz.com\""
+                        sh "git config --global user.name \"test\""
                         sh "./build.sh -t ${params.BUILD_TYPE} -u -c"
                     }
                 } catch (exc) {