Install and run yarn inside the docker container

Question

I have docker build which works fine. But i want to install version specific yarn inside the container(it is the task) and run it after building, cause i dont want rebuild the container for install new dependecies. Current Dockerfile and docker-compose.yml

Dockerfile:

FROM node:16.17.0-alpine 

WORKDIR /front

COPY package.json .

RUN yarn install

COPY . .

CMD ["yarn", "start"]

ENV PORT 8000

EXPOSE $PORT

docker-compose.yml

version: "3.8"

services: 
  frontend: 
    build: 
      context: .
      dockerfile: Dockerfile
      args:
        NODE_MAJOR: '16.17.0'
        YARN_VERSION: '1.22.19'
    image: front-dev:1.0.0
    container_name: front-dev
    volumes:
      - .:/front:cached
      - ./node_modules:/front/node_modules
    stdin_open: true
    tty: true
    env_file:
      - .env
    ports:
      - "8000:8000"
    environment:
      - NODE_ENV=development
    cpu_shares: 512
volumes:
  node_modules:

Answer 1

Install yarn with apk(equivalent for apk in alpine). Move yarn commands from Dockerfile to docker-compose.yml(like below)

Dockerfile:

FROM node:16.17.0-alpine 

WORKDIR /frontend

COPY package.json yarn.lock ./

RUN set -eux \
    & apk add \
        --no-cache \
        yarn

ENV PORT 8000

EXPOSE $PORT

docker-compose.yml

version: "3.8"

services: 
  front: 
    build: 
      context: .
      dockerfile: Dockerfile
      args:
        NODE_MAJOR: '16.17.0'
        YARN_VERSION: '1.22.19'
    image: front-dev:1.0.0
    container_name: front-dev
    volumes:
      - .:/frontend
      - ./node_modules:/frontend/node_modules
    stdin_open: true
    tty: true
    env_file:
      - .env
    ports:
      - "8000:8000"
    environment:
      - NODE_ENV=development
    cpu_shares: 512
    command: 'yarn start'
volumes:
  node_modules:

P.S It is make building process much more faster.