Docker 이미지 빌드 오류 해결

1. JDK 버전 일치성 문제 해결
   - Dockerfile OpenJDK 23 → Eclipse Temurin 21로 변경
   - 프로젝트 JDK 21과 일치시킴

2. Docker Hub Rate Limit 해결
   - Jenkinsfile에 Docker Hub 로그인 추가
   - dockerhub-credentials 자격증명 설정 필요
   - eclipse-temurin 이미지로 변경하여 안정성 향상

3. Jenkins 가이드 업데이트
   - Docker Hub Credentials 설정 방법 추가
   - Rate Limit 문제 해결 방안 제시

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

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

deployment/cicd/Jenkinsfile

@@ -123,12 +123,23 @@ podTemplate(
         stage('Build & Push Images') {
             timeout(time: 30, unit: 'MINUTES') {
                 container('podman') {
-                    withCredentials([usernamePassword(
+                    withCredentials([
+                        usernamePassword(
                             credentialsId: 'acr-credentials',
-                        usernameVariable: 'USERNAME',
-                        passwordVariable: 'PASSWORD'
-                    )]) {
-                        sh "podman login acrdigitalgarage01.azurecr.io --username \$USERNAME --password \$PASSWORD"
+                            usernameVariable: 'ACR_USERNAME',
+                            passwordVariable: 'ACR_PASSWORD'
+                        ),
+                        usernamePassword(
+                            credentialsId: 'dockerhub-credentials',
+                            usernameVariable: 'DOCKERHUB_USERNAME', 
+                            passwordVariable: 'DOCKERHUB_PASSWORD'
+                        )
+                    ]) {
+                        // Docker Hub 로그인 (rate limit 해결)
+                        sh "podman login docker.io --username \$DOCKERHUB_USERNAME --password \$DOCKERHUB_PASSWORD"
+                        
+                        // ACR 로그인
+                        sh "podman login acrdigitalgarage01.azurecr.io --username \$ACR_USERNAME --password \$ACR_PASSWORD"
 
                         services.each { service ->
                             sh """

deployment/cicd/jenkins-pipeline-guide.md

@@ -43,7 +43,15 @@ Manage Jenkins > Credentials > Add Credentials
 - Password: {ACR_PASSWORD}
 ```
 
-#### 3. SonarQube Token
+#### 3. Docker Hub Credentials (Rate Limit 해결용)
+```
+- Kind: Username with password
+- ID: dockerhub-credentials
+- Username: {DOCKERHUB_USERNAME}
+- Password: {DOCKERHUB_PASSWORD}
+```
+
+#### 4. SonarQube Token
 ```
 - Kind: Secret text
 - ID: sonarqube-token

deployment/container/Dockerfile-backend

@@ -1,11 +1,11 @@
 # Build stage
-FROM openjdk:23-oraclelinux8 AS builder
+FROM eclipse-temurin:21-jdk AS builder
 ARG BUILD_LIB_DIR
 ARG ARTIFACTORY_FILE
 COPY ${BUILD_LIB_DIR}/${ARTIFACTORY_FILE} app.jar
 
 # Run stage
-FROM openjdk:23-slim
+FROM eclipse-temurin:21-jre
 ENV USERNAME=k8s
 ENV ARTIFACTORY_HOME=/home/${USERNAME}
 ENV JAVA_OPTS=""