docker-compose for postgres with kr locale

.env

DB_USER=user_id
DB_PASSWORD=password
DB_NAME=db_name

docker-compose.yml

version: "3.8"
services:
  postgres_db:
    image: my_postgres:1.0
    build:
      context: .
      dockerfile: Dockerfile
    environment:
      POSTGRES_USER: ${DB_USER}
      POSTGRES_PASSWORD: ${DB_PASSWORD}
      POSTGRES_DB: ${DB_NAME}
    ports:
      - "5432:5432"
    volumes:
      - ./data:/var/lib/postgresql/data
      - "./init/:/docker-entrypoint-initdb.d/"
    container_name: postgres_db

Dockerfile

FROM postgres:13
RUN localedef -i ko_KR -c -f UTF-8 -A /usr/share/locale/locale.alias ko_KR.UTF-8
ENV LANG ko_KR.UTF-8