gitbutlerapp
Support GPG for commit signing
This is probably not terribly difficult, but unlike the SSH signing, we'll have to fork/exec out almost certainly. I don't think we'll be able to reliably get GPG to work on Windows in Rust. Every other implementation I know just calls a gpg binary externally, including core git.
The signed commit method is here, but it's taking an SSH key directly to use for signing, so that would have to change, or maybe another option to try gpg, dunno:
https://github.com/gitbutlerapp/gitbutler/blob/624df6243002ae4266c50f61b1e72daa44600e2b/gitbutler-app/src/git/repository.rs#L268-L295
That is called here:
https://github.com/gitbutlerapp/gitbutler/blob/624df6243002ae4266c50f61b1e72daa44600e2b/gitbutler-app/src/project_repository/repository.rs#L242-L260
Only if the private key is provided. We would need some way of tracking if they want to use gpg for signing and probably optionally where the binary is located.
Anyhow, a starting point for anyone interested. I'm not sure we'll tackle this internally soon, but it's probably not super difficult if someone cares a lot.
