[fix] #58 Dockerfile refactoring

Author: oOccasio

Dockerfile

@@ -1,10 +1,9 @@
 # ===== Stage 1: Build =====
-FROM gradle:8.14.2-jdk17-alpine AS builder
+FROM gradle:8-jdk17 AS builder
 
 WORKDIR /app
 
-# Gradle 캐시 최적화 (의존성만 먼저 다운로드)
-COPY build.gradle settings.gradle gradle.properties ./
+COPY build.gradle settings.gradle ./
 COPY gradle gradle
 RUN gradle dependencies --no-daemon
 
@@ -29,9 +28,5 @@ COPY --from=builder --chown=nonroot:nonroot /app/app.jar ./
 # 포트 노출
 EXPOSE 8080
 
-# 헬스체크 (Spring Boot actuator 기준)
-HEALTHCHECK --interval=30s --timeout=5s --start-period=60s --retries=3 \
-    CMD wget --no-verbose --tries=1 --spider http://localhost:8080/actuator/health || exit 1
-
 # 애플리케이션 실행
 ENTRYPOINT ["java", "-jar", "app.jar"]