Docker running both Yarn update and npm update on docker-compose up - node.js

Question

I am running a docker container that is containing my backend code as a volume:
docker-compose.yml
version: '3'
services:
auth:
container_name: ${AUTH_CONTAINER}
build: ./modules/auth
working_dir: /usr/app
command: "npm install && npm start"
volumes:
- ../backend/modules/auth:/usr/app
expose:
- 9229
ports:
- 9229:9229
Dockerfile:
FROM node:alpine
WORKDIR /usr/app
COPY entrypoint.sh .
ENTRYPOINT ["sh", "/entrypoint.sh"]
Entrypoint:
#!/usr/bin/env bash
exec "$#"
when I run docker-compose up, the first step is always to run yarn. I get an error saying that I should not use both npm and yarn, because I currently am using npm for the project. Is there a way to have node:alpine only use npm only (I know its installed) and then call npm install when docker-compose up is ran?
EDIT: image of console:
EDIT2: Package.json
{
"name": "auth",
"version": "1.0.0",
"description": "",
"main": "index.js",
"scripts": {
"start": "node index.js"
},
"author": "",
"license": "ISC",
"dependencies": {
"express": "^4.17.1"
}
}

Answer 1

For anyone that gets to this point- and is wondering why this is happening. Ensure that you run the docker-compose -- build FIRST before running docker-compose up that is the problem I was running into.
Dockerfile
FROM node:14
WORKDIR /usr/src/app
COPY package*.json ./
RUN npm install
COPY entrypoint.sh /
ENTRYPOINT ["sh", "/entrypoint.sh"]
entrypoint:
exec "$#"
docker-compose:
version: '3'
services:
auth:
container_name: "Auth"
build: "./auth"
working_dir: /usr/app
command: "npm start"
environment:
- NODE_ENV=local
volumes:
- ../backend/modules/auth:/usr/app
expose:
- 9299
ports:
- 9229:9229