Remove node_modules when no node runtime is installed in the image ?

In some cases (when grover is present for exemple) we need a node runtime to be able to launch some JS deps from ruby.

But, when no node runtime is installed, `node_modules` still lingers in the final image, which can consume a lot space.

I was wondering if this was on purpose, or if we could indeed remove the node_modules folder in this specific case ?

If so, I'm happy to write a PR for it if you give me some pointers on the preferred way to do it (just rm -r ? tweak the COPY statement ? )

No file or test is named in the issue. Trace the generator logic that adds Node dependencies to the image, then inspect the resulting image with and without a Node runtime; done means node_modules is absent when no runtime is installed and remains available when JavaScript dependencies need it.

Written by the indexing model from the issue text.