Conditionally change your git-config profile based on directory using includeIf option.

set-git-config-profile.sh

#!/usr/bin/env bash

PROFILE_NAME="$1"
CONFIG_FILE="$HOME/.gitconfig-$PROFILE_NAME"

function show_usage() {
    echo "Usage:"
    echo -e "\tset-git-config-profile.sh <profile-name>   : Sets the profile for current directory"
    echo -e "\tset-git-config-profile.sh -r               : Unsets any profile for current directory"
}

function create_empty_profile() {
    echo "Create empty profile: $CONFIG_FILE"
    touch "$CONFIG_FILE"
}

function add_config() {
    echo "Setting profile $PROFILE_NAME for current directory"
    git config --global "includeIf.gitdir:$PWD/.path" "$CONFIG_FILE"
}

function remove_config() {
    echo "Unsetting any profile for current directory"
    git config --global --unset "includeIf.gitdir:$PWD/.path"
}

if [ "$#" -ne 1 ]; then
    echo "You need to specify exactly one parameter"
    show_usage
    exit
fi

if [ "$PROFILE_NAME" = "-r" ]; then
    remove_config
    exit
fi

if [ ! -f "$CONFIG_FILE" ]; then
    while true
    do
        echo "Git config profile $CONFIG_FILE does not exist"
        read -p "Do you wish to create an empty one and continue? (yn) " yn
        case $yn in
            [Yy]* ) create_empty_profile; break;;
            [Nn]* ) echo "Exiting"; exit;;
            * ) echo "Please answer yes or no.";;
        esac
    done
fi

add_config