Gitsign doesn't support git config --global options

[wlynch]

Description

From @mattmoor:

I did --global, does that not work?


My ~/.gitconfig has this at the end:
[gpg "x509"]
        program = gitsign
[gpg]
        format = x509
[commit]
        gpgsign = true
[gitsign]
        connectorID = https://accounts.google.com/
which looks right?

If I configure it in the local repo it works 

Root cause appears to be go-git/go-git#508 - we're losing the custom gitsign config options when the configs are merged. This would also affect options set with git config --system

Version

v0.3.0

[wlynch]

To work around this, we can likely just reimplement what go-git does and handle the merge for gitsign related fields ourselves - https://github.com/go-git/go-git/blob/bc1f419cebcf7505db31149fa459e9e3f8260e00/repository.go#L496-L522