gistfile1.txt

#!/bin/bash
random_string() {
  < /dev/urandom tr -dc _A-Z-a-z-0-9 | head -c${1:-32}; echo;
}
: ${TABLE_PREFIX=wp_}
cat > /var/www/html/wp-config.php <<EOF
<?php
  define('DB_NAME', '$MYSQL_ENV_MYSQL_DATABASE');
  define('DB_USER', '$MYSQL_ENV_MYSQL_USER');
  define('DB_PASSWORD', '$MYSQL_ENV_MYSQL_PASSWORD');
  define('DB_HOST', 'mysql');

  define('DB_CHARSET', 'utf8');
  define('DB_COLLATE', '');

  define('AUTH_KEY',         '$(random_string)');
  define('SECURE_AUTH_KEY',  '$(random_string)');
  define('LOGGED_IN_KEY',    '$(random_string)');
  define('NONCE_KEY',        '$(random_string)');
  define('AUTH_SALT',        '$(random_string)');
  define('SECURE_AUTH_SALT', '$(random_string)');
  define('LOGGED_IN_SALT',   '$(random_string)');
  define('NONCE_SALT',       '$(random_string)');

  \$table_prefix  = '$TABLE_PREFIX';
  define('WP_DEBUG', false);

  if ( !defined('ABSPATH') )
    define('ABSPATH', dirname(__FILE__) . '/');
  require_once(ABSPATH . 'wp-settings.php');
EOF

exec "$@"