Merge pull request #155 from woodonggyu/master

fix: Invalid option and add environment variables

docker-compose.yml

@@ -8,25 +8,30 @@ services:
       context: .
       dockerfile: docker_utils/Dockerfile
     command: [sh, -c, "medallion --host 0.0.0.0"]
-    env:
+    environment:
       MEDALLION_BACKEND_MODULE_CLASS: "MongoBackend"
       MEDALLION_BACKEND_MONGO_URI: "mongodb://root:example@mongo:27017/"
     ports:
-      - 5000:5000
+      - "5000:5000"
   mongo:
     image: mongo
     restart: always
     ports:
-      - 27017:27017
+      - "27017:27017"
     environment:
+      MONGO_HOST: mongo
+      MONGO_PORT: 27017
       MONGO_INITDB_ROOT_USERNAME: root
       MONGO_INITDB_ROOT_PASSWORD: example
   mongo-express:
     image: mongo-express
     restart: always
     ports:
-      - 8081:8081
+      - "8081:8081"
     environment:
+      ME_CONFIG_MONGODB_SERVER: mongo
+      ME_CONFIG_MONGODB_PORT: 27017
+      ME_CONFIG_MONGODB_ENABLE_ADMIN: "true"
       ME_CONFIG_MONGODB_ADMINUSERNAME: root
       ME_CONFIG_MONGODB_ADMINPASSWORD: example
     depends_on: