prune container images on self-hosted runners #47

	# Copyright (C) 2021 Intel Corporation
	# SPDX-License-Identifier: BSD-3-Clause

	# https://docs.github.com/en/actions/reference/workflow-syntax-for-github-actions

	# https://docs.docker.com/config/pruning/
	name: prune container images on self-hosted runners

	# docker permits only a single prune operation at a time
	concurrency: container-prune

	on:
	push:
	branches:
	- main
	paths:
	- '.github/workflows/container-prune.yml'

	# https://docs.github.com/en/actions/learn-github-actions/events-that-trigger-workflows#scheduled-events-schedule
	schedule:
	# UTC time of midnight in Pacific Standard Time
	- cron: '0 8 * * *'

	workflow_dispatch:

	jobs:
	build:
	runs-on:
	- self-hosted
	- linux
	- x64
	- container

	steps:
	# https://pkg.go.dev/time#ParseDuration
	- name: prune stopped containers, unused networks, unused untagged images, and build cache older than a day
	run: docker system prune --force --filter 'until=24h'

	- name: prune unused tagged images older than a week
	run: docker system prune --force --all --filter 'until=168h'

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