Luis

Maybe add this as a flag at the moment and make it the default in a major version.

@olleolleolle what about `--fips` and have what it does in the description?

Hi @mydiemho is this still and issue for you?

@donghoang89 is this still an issue for you with the latest Gemstash version?

@benklop could you rebase this PR with master please, thank you! 🙇

Hi @duckinator We have a [Development section](https://github.com/bundler/gemstash#development) in the `README` i tried the instructions there to set up Gemstash and works well, i can't reproduce the errors you are getting,...

Would like to test this before merge 😬

@indirect did someone asked for permission?

What would be the warning you might want to see @djberg96 @ioquatix ?

@djberg96 Since a `signing_key` with an empty `cert_chain` will raise an exception https://github.com/rubygems/rubygems/blob/2c499655f29070c809dfea9f5fda6fac6850e62e/lib/rubygems/security/signer.rb#L144, this warning should be raised when `cert_chain` is empty and no signing_key is provided