新增learn-kubernetes（https://github.com/yyong-brs/learn-kubernetes）相关文件

learn/learn-kubernetes-master/kiamol/ch14/docker-images/image-of-the-day/Dockerfile

@@ -0,0 +1,17 @@
+FROM maven:3.6.3-jdk-11 AS builder
+
+WORKDIR /usr/src/iotd
+COPY pom.xml .
+RUN mvn -B dependency:go-offline
+
+COPY . .
+RUN mvn package
+
+# app
+FROM openjdk:11.0.11-jre-slim
+
+WORKDIR /app
+COPY --from=builder /usr/src/iotd/target/iotd-service-0.1.0.jar .
+
+EXPOSE 80
+ENTRYPOINT ["java", "-jar", "/app/iotd-service-0.1.0.jar"]