I am developing a web application that communicates with MongoDB, so I am using docker to develop/test locally.
My docker compose is like this:

services:
  auth-terrai:
    image: auth-app
    build:
      context: ..
      dockerfile: docker/Dockerfile
    command: air -c .air.toml
    volumes:
      - ../:/app
      - ../:/go/src/gitlab.com/main/server
    ports:
      - 8080:80
      - 10000:2345
    environment:
      - VERSION=0.0.1
      - TITLE= App
      - DESCRIPTION=
      - ENVIRONMENT=dev
      - HOST=localhost:8080
      - WHITE_LIST=./key/white_list.json
      - FIREBASE_SERVICE_ACCOUNT=./key/service_account.json
      - MONGO_URL=mongodb://abc123:abc123@urt-mongo-db:27017
      - MONGODB_NAME=auth
    networks:
      - urt-guane

  urt-mongo-db:
    image: mongo
    environment:
      MONGO_INITDB_ROOT_USERNAME: abc123
      MONGO_INITDB_ROOT_PASSWORD: abc123
      MONGO_INITDB_DATABASE: auth
    ports:
      - 27017:27017
    volumes:
      - urt-mongo-db:/data/db
    networks:
      - urt-guane

volumes:
  urt-mongo-db:
    external: true

networks:
  urt-guane:
    external: true

In a flow of my application, I need to use transactions, but I get this error:

Transaction numbers are only allowed on a replica set member or mongos

As I understand it, I must have a set of replicas to be able to use transactions. I really only want 1 replica, I just need to be able to test my flow. I was following several examples but it hasn’t worked for me. How should I modify my docker compose to be able to use transactions?