On appengine there is a limit of 10k files for deploy.
Using composer installed inside the theme we are out of this limit.
There is a way to load the vendor folder outside the project root, I tried to change the autoloader inside the sage functions.php file but it doesn’t seem to work: in fact it can’t find anything that is loaded at the controller level anymore inside app/composers
Has anyone ever solved a similar situation? For the assets there is no problem we can build them locally and pass them via git, but for composer it is a problem.