add dockerfile

Dockerfile

@@ -0,0 +1,18 @@
+
+# Build stage 
+FROM maven:3-openjdk-11-slim AS build
+COPY src /home/app/src
+COPY pom.xml /home/app
+RUN mvn clean compile assembly:single -f /home/app/pom.xml 
+
+# Package stage
+FROM openjdk:11-jre-slim
+RUN apt update && apt install -y libfreetype-dev && rm -rf /var/lib/apt/lists/*
+COPY --from=build /home/app/target/server.jar /usr/local/lib/server.jar
+COPY config /config
+
+VOLUME /config
+
+EXPOSE 8080
+CMD ["java","-jar","/usr/local/lib/server.jar"]
+