Generate .env (bash)

#!/bin/bash

read -rp "registry: " registry
read -rp "tg bot token: " bot_token
read -rp "jwt key [generated]: " jwt_key
jwt_key=${jwt_key:-$(openssl rand -hex 32)}
read -rp "admin chat id: " admin_chat_id
read -rp "service chat id: " service_chat_id
read -rp "cloudpayments public key: " pay_public
read -rp "cloudpayments secret key: " pay_api_key
read -rp "domain: " domain
read -rp "nginx port [80]: " nginx_port
nginx_port=${nginx_port:-80}
read -rp "backend port [5000]: " backend_port
backend_port=${backend_port:-5000}
read -rp "frontend port [3000]: " frontend_port
frontend_port=${frontend_port:-3000}
read -rp "default time zone: " timezone
read -rp "db user [user]: " postgres_user
postgres_user=${postgres_user:-user}
read -rp "db password [generated]: " postgres_password
postgres_password=${postgres_password:-$(openssl rand -hex 16)}
read -rp "db name [postgres]: " postgres_db
postgres_db=${postgres_db:-postgres}
read -rp "db port [5432]: " postgres_port
postgres_port=${postgres_port:-5432}

env_file=".env"
if [ -f "$env_file" ]; then
  env_file="generated.env"
fi

cat << EOF > $env_file
REGISTRY=$registry
BOT_TOKEN=$bot_token
JWT_KEY=$jwt_key
ADMIN_CHAT_ID=$admin_chat_id
SERVICE_CHAT_ID=$service_chat_id
PAY_PUBLIC=$pay_public
PAY_API_KEY=$pay_api_key
DOMAIN=$domain
NGINX_PORT=$nginx_port
BACKEND_PORT=$backend_port
FRONTEND_PORT=$frontend_port
TIMEZONE=$timezone
POSTGRES_USER=$postgres_user
POSTGRES_PASSWORD=$postgres_password
POSTGRES_DB=$postgres_db
POSTGRES_PORT=$postgres_port
EOF