Conditional .gitignore based on path (all example files can be saved in your ~/ directory)

.gitconfig

# Global .gitignore for all git projects
[core]
  excludesFile = ~/.gitignore

# Project-specific Settings
[includeIf "gitdir:~/repos/projectgroup/"]
  path = ~/.gitconfig-projectgroup

.gitconfig-projectgroup

[core]
  excludesFile = ~/.gitignore-projectgroup

.gitignore

# Applies to all git projects
.DS_Store

.gitignore-projectgroup

# Applies to all git projects in the ~/repos/projectgroup directory
.vscode