Assuming your work repositories are inside the ~/Projects/Acme folder.

1. First, create a separate Git config:

   git config -f ~/Projects/Acme/.gitconfig user.email "john.doe@acme.org"
   git config -f ~/Projects/Acme/.gitconfig user.name "John Doe"
   
   

2. Then, create ~/.gitconfig.local:

   [includeIf "gitdir:~/Projects/Acme/"]
     path = ~/Projects/Acme/.gitconfig
   

cd ~/dev/repo
git config user.email "john.doe@acme.org"
git config user.name "John Doe"