How to resolve UnicodeDecodeError Django

version : '3'

services:
  mysql:
    image: mysql:5.7
    container_name: new_mysql
    environment:
      MYSQL_USER: sandy
      MYSQL_PASSWORD: password
      MYSQL_ROOT_PASSWORD: password
      MYSQL_DATABASE: default_schema
    # command: --default-authentication-plugin=mysql_native_password
    ports:
      - 3306:3306
    volumes:
      - "./db_data:/var/lib/mysql"
      - "./conf:/etc/mysql/conf.d"
    networks:
      - net

  phpmyadmin:
    image: phpmyadmin/phpmyadmin
    container_name: phpmyadmin
    links:
      - mysql
    environment:
      PMA_HOST: mysql
      PMA_PORT: 3306
      PMA_ARBITRARY: 1
    restart: always
    ports:
      - 80:80
    networks:
      - net

networks: 
    net: 

docker.cnf

[mysqld]
skip-host-cache
skip-name-resolve
character-set-server = utf8
collation-server = utf8_unicode_ci


mysql.cnf
[mysql]



mysqldump.cnf

[mysqldump]
quick
quote-names
max_allowed_packet	= 16M