feat: add docker and demo_request.sh

hello_world/MongoExample/Dockerfile

@@ -0,0 +1,10 @@
+FROM maven:3.8.4-openjdk-17 AS build
+WORKDIR /app
+COPY . .
+RUN mvn clean package -DskipTests
+
+FROM openjdk:17-jdk-slim
+WORKDIR /app
+COPY --from=build /app/target/MongoExample-1.0.jar /app/app.jar
+ENTRYPOINT ["java", "-jar", "/app/app.jar"]
+EXPOSE 8080

hello_world/MongoExample/demo_request.sh

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+#!/bin/bash
+
+echo "GET request to /messages"
+curl http://localhost:8080/messages
+
+echo -e "\nPOST request to /messages"
+curl -X POST http://localhost:8080/messages -H "Content-Type: application/json" -d '{"content": "Hello, World!"}'
+
+echo -e "GET request to /messages after POST request"
+curl http://localhost:8080/messages

hello_world/MongoExample/docker-compose.yaml

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+version: '3.8'
+
+services:
+  app:
+    build: .
+    ports:
+      - "8080:8080"
+    environment:
+      SPRING_DATA_MONGODB_HOST: mongo
+    depends_on:
+      - mongo
+    networks:
+      - mynetwork
+
+  mongo:
+    image: mongo:8.0
+    ports:
+      - "27017:27017"
+    environment:
+      MONGO_INITDB_ROOT_USERNAME: admin
+      MONGO_INITDB_ROOT_PASSWORD: admin
+    networks:
+      - mynetwork
+
+networks:
+  mynetwork: