dokku-alt wordpress config.php (requires db-link) -- is default config.php + database config from linked dokku-alt database (diff against original config.php for changes...)

wp-config.php

<?php
// is default config.php though using db config from linked dokku-alt database via env var "DATABASE_URL" 
// diff against original config.php for changes...

/**
 * The base configurations of the WordPress.
 *
 * This file has the following configurations: MySQL settings, Table Prefix,
 * Secret Keys, WordPress Language, and ABSPATH. You can find more information
 * by visiting {@link http://codex.wordpress.org/Editing_wp-config.php Editing
 * wp-config.php} Codex page. You can get the MySQL settings from your web host.
 *
 * This file is used by the wp-config.php creation script during the
 * installation. You don't have to use the web site, you can just copy this file
 * to "wp-config.php" and fill in the values.
 *
 * @package WordPress
 */
define( 'WP_AUTO_UPDATE_CORE', false );

// dokku-alt integration
$DATABASE_URL = parse_url(getenv('DATABASE_URL'));
if (empty($DATABASE_URL)) {
    die('"DATABASE_URL" is not set.. have you linked the database?');
}

// ** MySQL settings - You can get this info from your web host ** //
/** The name of the database for WordPress */
define('DB_NAME', trim($DATABASE_URL['path'], '/')); // remove gunsnroses

/** MySQL database username */
define('DB_USER', $DATABASE_URL['user']);

/** MySQL database password */
define('DB_PASSWORD', $DATABASE_URL['pass']);

/** MySQL hostname */
define('DB_HOST', $DATABASE_URL['host']); // use ip instead of named host "localhost" as otherwise socket is tried

/** Database Charset to use in creating database tables. */
define('DB_CHARSET', 'utf8');

/** The Database Collate type. Don't change this if in doubt. */
define('DB_COLLATE', '');

/**#@+
 * Authentication Unique Keys and Salts.
 *
 * Change these to different unique phrases!
 * You can generate these using the {@link https://api.wordpress.org/secret-key/1.1/salt/ WordPress.org secret-key service}
 * You can change these at any point in time to invalidate all existing cookies. This will force all users to have to log in again.
 *
 * @since 2.6.0
 */
$salt = sha1(DB_NAME . 'salt'); // DB_NAME is linked database name.. so add your own salt <- this is the only dynamic config

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

/**#@-*/

/**
 * WordPress Database Table prefix.
 *
 * You can have multiple installations in one database if you give each a unique
 * prefix. Only numbers, letters, and underscores please!
 */
$table_prefix  = 'wp_';

/**
 * WordPress Localized Language, defaults to English.
 *
 * Change this to localize WordPress. A corresponding MO file for the chosen
 * language must be installed to wp-content/languages. For example, install
 * de_DE.mo to wp-content/languages and set WPLANG to 'de_DE' to enable German
 * language support.
 */
define('WPLANG', '');

/**
 * For developers: WordPress debugging mode.
 *
 * Change this to true to enable the display of notices during development.
 * It is strongly recommended that plugin and theme developers use WP_DEBUG
 * in their development environments.
define('WP_DEBUG', getenv('WP_ENV') === 'DEVELOPMENT');
 */
define('WP_DEBUG', false);

/* That's all, stop editing! Happy blogging. */

/** Absolute path to the WordPress directory. */
if ( !defined('ABSPATH') )
	define('ABSPATH', dirname(__FILE__) . '/');

/** Sets up WordPress vars and included files. */
require_once(ABSPATH . 'wp-settings.php');