codereview: define a git-user slug instead of a true/false config

README.md

@@ -40,6 +40,12 @@ Please refer to the [release page](https://github.com/actions/checkout/releases/
     #
     # Default: ${{ github.token }}
     token: ''
+    
+    # Github slug used to configure local user.name and user.email for git.
+    # This is required to push a commit from a Github Action Workflow
+    # Set to '' to disable this configuration
+    # Default: "github-action[bot]
+    git-config: ''
 
     # SSH key used to fetch the repository. The SSH key is configured with the local
     # git config, which enables your scripts to run authenticated git commands. The