moongoseServerError Docker Podman

Ops and Admin
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Hi guys I hope you can help me with this problem I am trying to mount an application in a podman container. on my computer I use docker and it works perfectly but when I run it on the podman server this problem occurs. My podman versions Version: 3.3.1 API Version: 3.3.1 Go Version: go1.16.7 Built: Tue Sep 21 04:41:42 2021 OS/Arch: linux/amd64
//////////////////// podman-compose version [‘podman’, ‘–version’, ‘’] using podman version: 3.3.1 podman-composer version 1.0.3 podman --version podman version 3.3.1 exit code: 0

////////////////////////////////////////////// error at podman-compose up

Uncaught Error MongooseServerSelectionError: getaddrinfo ENOTFOUND mongo
    at NativeConnection.Connection.openUri (/usr/src/app/node_modules/mongoose/lib/connection.js:807:32)
    at /usr/src/app/node_modules/mongoose/lib/index.js:343:10
    at /usr/src/app/node_modules/mongoose/lib/helpers/promiseOrCallback.js:32:5
    at new Promise (<anonymous>)
    at promiseOrCallback (/usr/src/app/node_modules/mongoose/lib/helpers/promiseOrCallback.js:31:10)
    at Mongoose._promiseOrCallback (/usr/src/app/node_modules/mongoose/lib/index.js:1181:10)
    at Mongoose.connect (/usr/src/app/node_modules/mongoose/lib/index.js:342:20)
    at dbConnection (/usr/src/app/DB/config.js:8:11)
    at Object.<anonymous> (/usr/src/app/index.js:28:1)
    at Module._compile (node:internal/modules/cjs/loader:1099:14) {
  reason: TopologyDescription {
    type: 'Unknown',
    servers: Map(1) { 'mongo:27017' => [ServerDescription] },
    stale: false,
    compatible: true,
    heartbeatFrequencyMS: 10000,
    localThresholdMS: 15,
    logicalSessionTimeoutMinutes: undefined
  },
  code: undefined
}
[nodemon] app crashed - waiting for file changes before starting...
Compiled with warnings.

/////////////////////////////////

code for config.js

const mongoose = require("mongoose");                       
                                                            
const dbConnection = async()=>{                             
    try{                                                                       
        mongoose.connect('mongodb://mongo:27017/Forms2', {  
        useNewUrlParser: true,                              
        useUnifiedTopology: true                                                         
        });                                                 
    console.log('MongoDB activa');                          
    }catch(error){                                          
        console.log(error);                                 
        throw new Error('error iniciando MongoDB');         
        process.exit(1);                                    
}                                                           
}                                                           
                                                            
    module.exports ={                                           
        dbConnection                                            
    }

//////////////////////
docker-copose.yml

version: '3'
services:
  react-app:
    image: react-app
    build: ./frontend/
    stdin_open: true
    container_name: frontend
    ports:
     - "3000:3000"
    networks:
     - mern-app
    logging:
     driver: "none"
  api-server:
    image: api-server
    restart: always
    build: ./backend/
    container_name: backend
    ports:
     - "4000:4000"
    networks:
     - mern-app
    depends_on:
     - mongo
  mongo:
    image: mongo
    ports:
     - "27017:27017"
    networks:
     - mern-app
    volumes:
     - mongo-data:/data/db
networks:
  mern-app:
    driver: bridge
volumes:
  mongo-data:
    driver: local