Default to main branch on git init

setup-git-main-default.sh

#!/bin/bash -x

# from git 2.28
git config --global init.defaultBranch main

# before git 2.28
# set git to use "main" instead of "master" on `git init`
# suggestion - run commands these manually!

# show existing settings
git config --global --list

# add in a new template
mkdir -p .git-template
echo "ref: refs/heads/main" > ~/.git-template/HEAD
git config --global init.templateDir ~/.git-template

# show new settingss
git config --global --list

# test
mkdir test_project && cd test_project && git init && git status
cd .. && rm -r test_project