更改构建镜像流水线为v2

SCM/构建镜像/build_image_flymoon_email_v2.groovy

@@ -131,7 +131,7 @@ pipeline {
                 }
             }
         }
-        stage('登录容器仓库') {
+        stage('登录仓库') {
             steps {
                 withCredentials([usernamePassword(
                     credentialsId: env.CREDENTIALS_ID,
@@ -144,7 +144,7 @@ pipeline {
                 }
             }
         }
-        stage('构建容器镜像') {
+        stage('构建镜像') {
             steps {
                 script {
                     // 构建镜像，添加标签信息
@@ -162,7 +162,7 @@ pipeline {
                 }
             }
         }
-        stage('推送镜像到仓库') {
+        stage('推送镜像') {
             steps {
                 script {
                     sh "docker push ${REGISTRY}/${NAMESPACE}/${IMAGE_NAME}:${IMAGE_TAG}"
@@ -175,7 +175,7 @@ pipeline {
     post {
         always {
             script {
-                def keepCount = 2
+                def keepCount = 3
                 echo "开始清理本地旧镜像，仅保留最近 ${keepCount} 个构建版本"
                 def imagePrefix = "${REGISTRY}/${NAMESPACE}/${IMAGE_NAME}"