启动亚马逊网络服务EC2实例时，如何使用bash脚本运行postgres？

#!/bin/bash

# 安装PostgreSQL
sudo apt-get update
sudo apt-get install postgresql -y

# 启动PostgreSQL服务
sudo service postgresql start

# 创建数据库和用户
sudo -u postgres psql -c "CREATE DATABASE mydb;"
sudo -u postgres psql -c "CREATE USER myuser WITH ENCRYPTED PASSWORD 'mypassword';"
sudo -u postgres psql -c "GRANT ALL PRIVILEGES ON DATABASE mydb TO myuser;"

# 修改PostgreSQL配置文件以允许远程连接
sudo sed -i "s/#listen_addresses = 'localhost'/listen_addresses = '*'/" /etc/postgresql/12/main/postgresql.conf
echo "host    all             all             0.0.0.0/0               md5" | sudo tee -a /etc/postgresql/12/main/pg_hba.conf

# 重启PostgreSQL服务
sudo service postgresql restart