added back dockerfile

Dockerfile

@@ -0,0 +1,12 @@
+FROM maven:3.9.6-eclipse-temurin-17 AS build
+WORKDIR /app
+COPY . .
+RUN mvn clean package -DskipTests
+
+FROM eclipse-temurin:17-jre
+WORKDIR /home/user/app
+COPY --from=build /app/target/*.jar ./app.jar
+
+ENV PORT=7860
+EXPOSE 7860
+CMD ["java", "-jar", "app.jar", "--server.port=7860"]