Setting image pullPolicy to Always on Deploy stage

ci/jenkins/step/deploySingle2Dev.groovy

@@ -3,5 +3,5 @@ sh 'helm repo add stable https://kubernetes.oss-cn-hangzhou.aliyuncs.com/charts'
 sh 'helm repo update'
 dir ('milvus-helm') {
     checkout([$class: 'GitSCM', branches: [[name: "master"]], userRemoteConfigs: [[url: "https://github.com/milvus-io/milvus-helm.git", name: 'origin', refspec: "+refs/heads/master:refs/remotes/origin/master"]]])
-    sh "helm install --wait --timeout 300s --set image.repository=registry.zilliz.com/milvus/engine --set image.tag=${DOCKER_VERSION} --set service.type=ClusterIP -f ci/db_backend/sqlite_${BINARY_VERSION}_values.yaml -f ci/filebeat/values.yaml --namespace milvus ${env.HELM_RELEASE_NAME} ."
+    sh "helm install --wait --timeout 300s --set image.repository=registry.zilliz.com/milvus/engine --set image.tag=${DOCKER_VERSION} --set image.pullPolicy=Always --set service.type=ClusterIP -f ci/db_backend/sqlite_${BINARY_VERSION}_values.yaml -f ci/filebeat/values.yaml --namespace milvus ${env.HELM_RELEASE_NAME} ."
 }

ci/jenkins/step/singleDevNightlyTest.groovy

@@ -12,7 +12,7 @@ timeout(time: 90, unit: 'MINUTES') {
         }
     }
     dir ("milvus-helm") {
-        sh "helm install --wait --timeout 300s --set image.repository=registry.zilliz.com/milvus/engine --set image.tag=${DOCKER_VERSION} --set service.type=ClusterIP -f ci/db_backend/mysql_${BINARY_VERSION}_values.yaml -f ci/filebeat/values.yaml --namespace milvus ${env.HELM_RELEASE_NAME} ."
+        sh "helm install --wait --timeout 300s --set image.repository=registry.zilliz.com/milvus/engine --set image.tag=${DOCKER_VERSION} --set image.pullPolicy=Always --set service.type=ClusterIP -f ci/db_backend/mysql_${BINARY_VERSION}_values.yaml -f ci/filebeat/values.yaml --namespace milvus ${env.HELM_RELEASE_NAME} ."
     }
     dir ("tests/milvus_python_test") {
         sh "pytest . --alluredir=\"test_out/dev/single/mysql\" --ip ${env.HELM_RELEASE_NAME}.milvus.svc.cluster.local"

ci/jenkins/step/singleDevTest.groovy

@@ -13,7 +13,7 @@ timeout(time: 60, unit: 'MINUTES') {
     //     }
     // }
     // dir ("milvus-helm") {
-    //     sh "helm install --wait --timeout 300s --set image.repository=registry.zilliz.com/milvus/engine --set image.tag=${DOCKER_VERSION} --set service.type=ClusterIP -f ci/db_backend/mysql_${BINARY_VERSION}_values.yaml -f ci/filebeat/values.yaml --namespace milvus ${env.HELM_RELEASE_NAME} ."
+    //     sh "helm install --wait --timeout 300s --set image.repository=registry.zilliz.com/milvus/engine --set image.tag=${DOCKER_VERSION} --set image.pullPolicy=Always --set service.type=ClusterIP -f ci/db_backend/mysql_${BINARY_VERSION}_values.yaml -f ci/filebeat/values.yaml --namespace milvus ${env.HELM_RELEASE_NAME} ."
     // }
     // dir ("tests/milvus_python_test") {
     //     sh "pytest . --alluredir=\"test_out/dev/single/mysql\" --level=1 --ip ${env.HELM_RELEASE_NAME}.milvus.svc.cluster.local"