The simplest of Git deployment scripts: Just ping it!

deploy.cgi

#!/bin/sh -eu
while read -r discard; do :; done; unset -v discard
echo 'Content-Type: text/plain; charset=UTF-8'
echo 'Cache-Control: no-store, max-age=0'
echo
git fetch -q github main
git reset --hard github/main
git clean -d -e '/deploy.cgi' -x

git:config

[core]
	repositoryformatversion = 0
	filemode = false
	bare = false
	logallrefupdates = false
[remote "github"]
	url = https://github.example/YoMama/Fat.git
	fetch = +refs/heads/*:refs/remotes/github/*
[clean]
	requireForce = false

I'm actually using a more cryptic file name so people can't hammer it.