Create an app with a custom client theme

I have an app with a default theme ( less

files defined in app/sytles

and included in app.less

) and available on my main website (for example http://www.example.com

)

Now I need to create the same application for different clients. Each client has its own style setting ( client.less

file) and its own resources (images, fonts, ...). This site will be deployed for example http://client1.example.com

.

My idea was to customize the build process by passing an extra flag to the command ember build --environment production

and customizing the build process by adding a file as needed client.less

. Something like ember build --environment production --theme client1

, but as far as I can see, there is no way to pass additional flags to the command build

. Am I missing something? Is there a better way to accomplish this? Any help is really appreciated, I will not support one project per client.