Describe the solution you'd like
It is often useful to submit signed commits to repos, it would be good if git-xargs could enable this (likely by a feature flag)

Describe alternatives you've considered
There might be a way to change my system defaults to always do this? It would depend on whether you're using the command line git tool or golang packages for git interaction, and I haven't dug into the code

Additional context
Great tool. Thanks for making and maintaining it!