Jenkinsfile kubectl 이미지 변경

- bitnami/kubectl → lachlanevenson/k8s-kubectl로 변경
- non-root 사용자 권한 문제 해결

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <noreply@anthropic.com>

deployment/cicd/Jenkinsfile

@@ -48,7 +48,7 @@ podTemplate(
         ),
         containerTemplate(
             name: 'kubectl',
-            image: 'bitnami/kubectl:latest',
+            image: 'lachlanevenson/k8s-kubectl:latest',
             command: 'cat',
             ttyEnabled: true,
             resourceRequestCpu: '200m',