Use CI caches for downloaded files instead of installed ones #687
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This allows for a more meaningful build: if a newer version of a sub-package breaks, builds would still pass as it uses the cached version. This uses a cache for downloaded packages instead.
I am expecting this to slow down a little bit the builds (but we are OK overall) but be more accurate in practice.
See https://docs.npmjs.com/cli/cache#configuration and https://docs.npmjs.com/files/folders#node-modules.