Could not install boilerplate app to site

I am still quite new to ERPNext, and I am trying to install a new custom app to a site, but I seem to fail.
I am using the frapper_docker, and I go into the container to execute these commands:
bench make-app /home/frappe/frappe-bench/apps sampleapp
bench --site sitename install-app sampleapp

But I get the error:
Could not find app “sampleapp”

I noticed that the app is successfully created, but I just cannot install it. Any steps that I am missing? Thanks.

If you’re using production installation you need to build your own image with set of custom apps.



Thanks. I guess its best to use Github to develop the custom app.