dockerfile aktualisiert

dockerfile

@@ -1,6 +1,22 @@
-FROM eclipse-temurin:17-jdk
+# Stage 1: Build the JAR
+FROM eclipse-temurin:17-jdk AS build
 
-COPY ./target/*.jar app.jar
+WORKDIR /app
+
+# Copy Maven files and source code
+COPY pom.xml .
+COPY src ./src
+
+# Build the Spring Boot app
+RUN ./mvnw clean package -DskipTests
+
+# Stage 2: Runtime
+FROM eclipse-temurin:17-jdk-slim
+
+WORKDIR /app
+
+# Copy built JAR from build stage
+COPY --from=build /app/target/*.jar app.jar
 
 EXPOSE 8080