Add dockerfile

Dockerfile

@@ -0,0 +1,13 @@
+# Stage 1: Build JAR with Maven
+FROM maven:3.9.6-eclipse-temurin-21 AS build
+WORKDIR /app
+COPY pom.xml .
+COPY src ./src
+RUN mvn clean package -DskipTests
+
+# Stage 2: Run with JRE
+FROM eclipse-temurin:21-jre
+WORKDIR /app
+COPY --from=build /app/target/*.jar app.jar
+EXPOSE 8080
+ENTRYPOINT ["java", "-jar", "/app/app.jar"]