Garbage collect github CI cache #4163

	name: Garbage collect github CI cache

	# Run every hour
	on:
	workflow_dispatch:
	schedule:
	- cron: 0 * * * *

	permissions:
	actions: write

	jobs:
	run-script:
	strategy:
	matrix:
	key_prefix: [ccache-short-clang-Release-ON-ON, sccache-windows-2022-cl-cl-release-OFF-ON-ON]

	name: Garbage collect cache
	runs-on: ubuntu-latest
	steps:
	- name: Get CIRCT
	# Clone the CIRCT repo and its submodules. Do shallow clone to save clone
	# time.
	uses: actions/checkout@v3
	with:
	fetch-depth: 2
	submodules: "false"
	- name: Set git safe
	run: \|
	git config --global --add safe.directory $PWD
	- name: Check cache and remove
	env:
	GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
	run: \|
	# Keep top 3 caches (in the case LLVM bump involved)
	gh cache list -k ${{ matrix.key_prefix }} -L 50
	gh cache list -k ${{ matrix.key_prefix }} -L 50 --jq ".[3:]\|.[].id" --json id \| ./utils/delete-cache.sh

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