For others looking for examples, there's a bunch of custom app templates I made that should help getting started:
https://git.cloudron.io/cloudron/tutorial-php-app/ https://git.cloudron.io/cloudron/tutorial-nodejs-app https://git.cloudron.io/cloudron/tutorial-basic https://git.cloudron.io/cloudron/tutorial-redis https://git.cloudron.io/cloudron/tutorial-supervisor-app