fix ci helm params (#2333)

* fix ci helm params

* update cron

ci/jenkins/Jenkinsfile

 #!/usr/bin/env groovy
 
 String cron_timezone = "TZ=Asia/Shanghai"
-String cron_string = BRANCH_NAME == "0.9.0" ? "14 17 * * * " : ""
+String cron_string = BRANCH_NAME == "0.9.0" ? "04 21 * * * " : ""
 
 pipeline {
     agent none

ci/jenkins/step/shardsDevNightlyTest.groovy

@@ -6,7 +6,7 @@ timeout(time: 180, unit: 'MINUTES') {
         checkout([$class: 'GitSCM', branches: [[name: "nightly"]], userRemoteConfigs: [[url: "https://github.com/milvus-io/milvus-helm.git", name: 'origin', refspec: "+refs/heads/nightly:refs/remotes/origin/nightly"]]])
         retry(3) {
             try {
-                sh "helm install --wait --timeout 300s --set mishards.enabled=true --set persistence.enabled=true --set image.repository=registry.zilliz.com/milvus/engine --set mishards.imag.tag=0.9.0-rc --set image.tag=${DOCKER_VERSION} --set image.pullPolicy=Always --set service.type=ClusterIP -f ci/db_backend/mysql_${BINARY_VERSION}_values.yaml --namespace milvus ${env.SHARDS_HELM_RELEASE_NAME} ."
+                sh "helm install --wait --timeout 300s --set mishards.enabled=true --set persistence.enabled=true --set image.repository=registry.zilliz.com/milvus/engine --set mishards.image.tag=0.9.0-rc --set image.tag=${DOCKER_VERSION} --set image.pullPolicy=Always --set service.type=ClusterIP -f ci/db_backend/mysql_${BINARY_VERSION}_values.yaml --namespace milvus ${env.SHARDS_HELM_RELEASE_NAME} ."
             } catch (exc) {
                 def helmStatusCMD = "helm get manifest --namespace milvus ${env.SHARDS_HELM_RELEASE_NAME} | kubectl describe -n milvus -f - && \
                                      kubectl logs --namespace milvus -l \"app=milvus,release=${env.SHARDS_HELM_RELEASE_NAME}\" -c milvus && \