User git config can cause commands to permenantly hang

[sukima]

I ran ember-cli-update on a project only to discover that the command would freeze indefinitely. I used the DEBUG to find it froze on the command git tag. Running this command myself I discovered it opened my text editor to ask for a tag message. This was due to me adding the following config to my ~/.gitconfig.

[tag]
  gpgsign = true

This can be avoided if the command for commit and tag were passed the --no-sign argument which will disable that flag if someone were to enable it (like I did).