Rudder plugins » Branding

Some dependencies used in our project (like elm-ui) cannot be installed using elm-make and needs to use elm-install (https://github.com/gdotdesign/elm-github-install).

That command needs to be installed before on ci before being used to create the plugin (done using gem install)

For now i propose to do in build-app.sh elm-install only if elm stuff directory does not exists, or build time will increase a lot during development

I propose to add an option later to force elm-install call