如何在docker compose启动时创建postgresql表

version: '3'
services:
  db:
    image: postgres
    environment:
      POSTGRES_USER: your_username
      POSTGRES_PASSWORD: your_password
      POSTGRES_DB: your_database
    ports:
      - 5432:5432

CREATE TABLE IF NOT EXISTS your_table (
  id SERIAL PRIMARY KEY,
  name VARCHAR(100) NOT NULL,
  age INT NOT NULL
);

version: '3'
services:
  db:
    image: postgres
    environment:
      POSTGRES_USER: your_username
      POSTGRES_PASSWORD: your_password
      POSTGRES_DB: your_database
    ports:
      - 5432:5432
    volumes:
      - ./init.sql:/docker-entrypoint-initdb.d/init.sql

docker-compose up