This is my kludgy way of running phpMyAdmin on Heroku. All you need to do is
customize config.inc.php as you would normally to get things running.
Note: The config.inc.php is the sample file provided with phpMyAdmin.
Please register an issue or submit a PR if you think there's a better way of doing this!
To see this in action, go to https://phpmyadmin-heroku.herokuapp.com which is
built from the sample_cleardb branch. That config.inc.php has been
configured to bypass login and give complete access. Please be friendly.