chore: production error i try to build jar before

Author: devcom33

backend/Dockerfile

@@ -1,12 +1,13 @@
-FROM eclipse-temurin:17-jdk-alpine
-
+# Stage 1: build JAR
+FROM maven:3.9.2-eclipse-temurin-17 AS build
 WORKDIR /app
+COPY pom.xml .
+COPY src ./src
+RUN mvn clean package -DskipTests
 
-
-# Copy the prebuilt JAR from Maven
-COPY target/*.jar habitflow-image.jar
-
+# Stage 2: runtime
+FROM eclipse-temurin:17-jdk-alpine
+WORKDIR /app
+COPY --from=build /app/target/*.jar habitflow-image.jar
 EXPOSE 8080
-
 ENTRYPOINT ["java", "-jar", "habitflow-image.jar"]
-