Prune Untagged Images #299

	---
	name: Prune Untagged Images
	on:
	schedule:
	- cron: '22 1 * * *' # 22 past 1am daily
	workflow_dispatch:

	jobs:
	prune_images:
	runs-on: ubuntu-latest
	steps:
	- uses: actions/github-script@v6
	with:
	github-token: ${{ github.token }}
	# Based on https://github.com/orgs/community/discussions/26716#discussioncomment-3253034
	# Thanks to @jcansdale
	script: \|
	const response = await github.request("GET /${{ env.OWNER }}/packages/container/${{ env.PACKAGE_NAME }}/versions",
	{ per_page: ${{ env.PER_PAGE }}
	});

	empty_tag_versions = response.data.filter(function(version) {
	return version.metadata.container.tags.length == 0;
	}
	)
	sort_by_created_date = function(a, b) {
	date_a = new Date(a.created_at)
	date_b = new Date(b.created_at)
	// Oldest first
	if ( date_a > date_b) {
	return 1;
	} else if ( date_b > date_a ) {
	return -1;
	} else {
	return 0;
	}
	}

	empty_tag_versions.sort(sort_by_created_date)

	console.log(empty_tag_versions)

	num_to_delete = empty_tag_versions.length - ${{ env.KEEP_MIN }}
	console.log("Number of versions to delete: " + num_to_delete)
	for (let i = 0; i < num_to_delete; i++){
	version = empty_tag_versions[i]
	console.log("delete " + version.id)
	const deleteResponse = await github.request("DELETE /${{ env.OWNER }}/packages/container/${{ env.PACKAGE_NAME }}/versions/" + version.id, { });
	console.log("status " + deleteResponse.status)
	}

	env:
	OWNER: orgs/UtrechtUniversity
	PACKAGE_NAME: SRC-test-workspace
	KEEP_MIN: 6
	PER_PAGE: 100

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