Reducing the size of a django/mysql docker image [closed]

I am currently using this Dockerfile to build my backend service:

FROM python:3.9-busterENV PYTHONUNBUFFERED 1WORKDIR /appCOPY requirements.txt /app/requirements.txtRUN pip install -r requirements.txtCOPY . /appCMD python manage.py runserver 0.0.0.0:8002

I also have a mysql database the Docker-compose file is:

version: '3.8'services:     dj:        build:             context: .            dockerfile: Dockerfile        ports:            - 8000:8002        volumes:             - .:/app        depends_on:             - db    db:        image: mysql:5.7.22        restart: always        environment:             MYSQL_DATABASE: ...            MYSQL_USER: ...            MYSQL_PASSWORD: ...            MYSQL_ROOT_PASSWORD: ...        volumes:            - .dbdata:/var/lib/mysql        ports:             - 33068:3306    

I want to reduce the size of my container which is currently 1.2G any detailed explanation on how to do that would be helpful, precisely I want to know how to do a multisatge build or use a lighter base image properly because I looked at some blogs that use the alpine as their base image but that doesn't work for me probably because my requirement.txt:

Django==3.1.3djangorestframework==3.12.2django-cors-headers==3.5.0djangorestframework-simplejwt==4.7.1pyjwt==2.1.0mysqlclient==2.0.1django-mysql==3.9

doesn't include everything needed.I am not sure if this is the right place to ask the question I already posted it on SO hours ago but got no answer.