fix: 用 alpine/k8s 替换无 shell 的 kubectl 镜像；冒烟测试改用 service DNS

Jenkinsfile

@@ -15,7 +15,7 @@ spec:
         - name: docker-config
           mountPath: /kaniko/.docker
     - name: kubectl
-      image: rancher/kubectl:v1.34.9
+      image: alpine/k8s:1.34.12
       command: ["sleep"]
       args: ["999999"]
   volumes:
@@ -92,11 +92,9 @@ spec:
                     sh '''
                     set -e
                     for i in $(seq 1 20); do
-                      CODE=$(kubectl -n apps run smoke-$$ --rm -i --restart=Never \
-                             --image=curlimages/curl:8.10.1 --quiet -- \
-                             -s -o /dev/null -w "%{http_code}" http://blog/healthz 2>/dev/null || echo 000)
-                      if [ "$CODE" = "200" ]; then echo "健康检查通过"; exit 0; fi
-                      echo "第 $i 次: $CODE, 等待中..."; sleep 3
+                      CODE=$(curl -s -o /dev/null -w "%{http_code}" http://blog.apps.svc.cluster.local/healthz || true)
+                      if [ "$CODE" = "200" ]; then echo "健康检查通过 (第 $i 次)"; exit 0; fi
+                      echo "第 $i 次: $CODE"; sleep 3
                     done
                     echo "健康检查失败"; exit 1
                     '''