prune.yml

---
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: 3
          PER_PAGE: 100