Update check-reference.yml #12

	name: Check patch references

	on:
	push:
	branches-ignore:
	- dependabot/**
	schedule:
	# Once every day at midnight UTC
	- cron: "0 0 * * *"

	jobs:
	cleanup:
	runs-on: ubuntu-latest
	steps:
	- name: Checkout patches
	uses: actions/checkout@v4

	- name: Checkout core
	uses: actions/checkout@v4
	with:
	repository: 'homebrew/homebrew-core'
	path: homebrew-core

	- name: Configure Git user
	uses: Homebrew/actions/git-user-config@master
	with:
	username: BrewTestBot

	- name: Detect references
	run: \|
	core_patches=$(git -C homebrew-core grep -h "Homebrew/formula-patches" \| awk -F/ '{print $(NF-1)"/"$NF}' \| tr -d '"')
	all_patches=$(git ls-files -- '/' ':^./')

	git checkout -b remove-unused-patches

	for patch in $all_patches; do
	if ! grep -qx "$core_patches" <<< "$patch"; then
	echo "Unused patch: $patch; deleting."
	git rm "$patch"
	git commit -m "${patch%%/}: remove unused ${patch#/}"
	fi
	done

	git push origin remove-unused-patches

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