garbage collection #17

	name: garbage collection
	on:
	# pull_request:
	# types: [opened, reopened, synchronize]
	# https://crontab.guru/#0_1_1__
	workflow_dispatch:
	schedule:
	- cron: "0 1 1 * *"
	permissions:
	actions: write
	contents: write
	id-token: write
	env:
	GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
	jobs:
	garbage_collection:
	name: Remove old build result on GH page
	runs-on: ubuntu-latest
	steps:
	- uses: actions/checkout@v4
	with:
	ref: gh-pages

	- id: remove
	run: \|
	OLD_FOLDERS=$(git ls-tree -r --name-only gh-pages@{30.days.ago} \| cut -d/ -f1 \| uniq)
	echo OLD_FOLDERS=$OLD_FOLDERS
	if [ -z "$OLD_FOLDERS" ]; then
	echo "result=''" >> $GITHUB_OUTPUT
	else
	rm -r $OLD_FOLDERS
	git add .
	git config --local user.email "github-actions[bot]@users.noreply.github.com"
	git config --local user.name "github-actions[bot]"
	git commit -m "docs: 🤖 garbage collection old build results"
	echo "result=1" >> $GITHUB_OUTPUT
	fi

	- name: Push changes
	uses: ad-m/github-push-action@master
	if: ${{ steps.remove.outputs.result == 1 }}
	with:
	github_token: ${{ env.GITHUB_TOKEN }}
	branch: gh-pages

	trigger_schedule:
	name: Schedule
	needs: [garbage_collection]
	uses: ./.github/workflows/schedule.yml

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