Hello,

I'm not really sure how phpMyAdmin was installed on your instance so I can't really help you on that.

You might be able to do what you want by either:
- use a different server_name and do what your want within /etc/nginx/conf.d/<your_custom>.conf. Basically you will probably have to set up a PHP-FPM pool and indicate to nginx to load the PHP scripts of PHPMyAdmin with this pool.
- rely on whatever Tuleap for its own scripts and mark the location of your PHPMyAdmin in your own conf file in /etc/nginx/conf.d/tuleap.d/
Both of these solutions can not really be recommended.

Since Tuleap does support in any ways PHPMyAdmin, I'm going to declined this request.