Add Dockerfile

Dockerfile

+FROM openjdk:17
+ARG JAR_FILE=target/myspringweb*.jar
+COPY ${JAR_FILE} app.jar
+EXPOSE 8888
+ENTRYPOINT ["java","-jar","/app.jar"]
+
+# How To build
+# mvn package
+# docker build -t test .
+# How to run
+# docker run -d -p 8888:8888 test