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related with #684
There are many concerns which means using actions/cache is never enough for caching CPAN modules (e.g., incomplete cache key, cleaning old modules when restoring from another key, correctly hashing the lockfile if not checked in, OS versions, ABI compatibility, etc.)
So, actions-setup-perl should provides installing and caching CPAN modules.
Actually, the setup-ruby action provides installing and caching gem option.
https://github.com/ruby/setup-ruby#caching-bundle-install-automatically