Feature Request: GPG - set default pinentry

[jessebot]

Describe the feature you'd like, and why

In order to have gpg prompt for a password on the command line when you do things like git commit -S, you need a valid pinentry (pronounced "pin entry"). By default, I'd like to set TTY on Linux, to prompt in the terminal, and touchID on macOS. It'd be cool to either find a way to use touchID on linux, or perhaps a yubikey.

Refereneces

• pinentry with touchID
• YubiKey Guide covering GPG
• tangentially related: yubikey over ssh

Additional context

Not sure if this should be set in the default dot files or not.