Until yesterday, to be able to use Joplin-Web, We had to install it on a workstation (because we need to access to the webclipper service)
Now, joplin can be run headless with:
joplin --profile ~/.config/joplin-desktop/ server start
Server is already running on port 41184
just after having update the joplin terminal version by
NPM_CONFIG_PREFIX=~/.joplin-bin npm install -g joplin
This allow you, now, to install the project on a dedicated server near your joplin resources 
Thanks to @laurent !