chore: add "Java" and "kubernetes" tags to post metadata

Author: eottabom

posts/java/java-application-on-kubernetes.mdx

@@ -1,7 +1,7 @@
 ---
 title: "Java Application on kubernetes"
 date: "2024-05-22"
-tags: ["Java"]
+tags: ["Java", "kubernetes"]
 updated: "2025-09-02"
 summary: "Practical JVM and container tuning tips: memory sizing, CPU settings, probes, and GC choices tailored for K8s."
 description: "컨테이너/Kubernetes 환경에서 Java 애플리케이션을 안정적으로 운영하기 위한 메모리/CPU 설정, 프로브, GC, QoS 전략 정리"