Docker compose postgresql

docker-compose-postgres.yml

version: '3.1'

services:
  db_postgres:
    container_name: db_postgres_mynykah
    image: postgres
    environment:
      POSTGRES_DB: postgres
      POSTGRES_USER: postgres
      POSTGRES_PASSWORD: password123
      PGDATA: /var/lib/postgresql/data/pgdata
    volumes:
      - ./pgdata:/var/lib/postgresql/data
    ports: 
      - "8875:5432"
    restart: unless-stopped