Configuring postgres database

configure_postgres.sh

#!/usr/bin/env bash

DB_USER=${DB_USER:-"default_user"}
DB_PASSWORD=${DB_PASSWORD:-"default_password"}
DB_NAME=${DB_NAME:-"default_name"}

sudo -u postgres psql -c "CREATE USER $DB_USER WITH PASSWORD '$DB_PASSWORD';"
sudo -u postgres psql -c "CREATE DATABASE $DB_NAME;"
sudo -u postgres psql -c "GRANT ALL PRIVILEGES ON DATABASE $DB_NAME TO $DB_USER;"