[BACKEND] Dockerfile 수정 (#76)

Author: ddoed

backend/Dockerfile

@@ -1,11 +1,9 @@
 FROM gradle:8.7-jdk21-alpine as build
-
 WORKDIR /app
 COPY . .
-RUN gradle clean build -x test
-
+RUN gradle clean build -x test --no-daemon
 
-FROM openjdk:23-slim
+FROM eclipse-temurin:21-jdk
 WORKDIR /app
 COPY --from=build /app/build/libs/*jar server.jar
-CMD ["java", "-jar","./server.jar"]
+CMD ["java", "-jar", "./server.jar"]