cache_clean.yml

# Cache clean workflow

name: Cache clean

on:
  # TODO restore schedule
  #schedule:
  #  # Run Mon-Sun at 11pm
  #  - cron: '00 23 * * 1-7'
  workflow_dispatch:
   inputs:
      dryrun:
        required: true
        type: boolean
        default: true
  # TODO delete pull_request
  pull_request:

concurrency:
  group: ${{ github.workflow }}-${{ github.ref }}
  cancel-in-progress: true

jobs:
  clean_cache:
    name: Cache clean
    runs-on: ubuntu-latest
    permissions:
      actions: write
    steps:
      - name: Checkout repo
        uses: actions/checkout@v4.1.0
        with:
          sparse-checkout: .github
      - name: Cache clean
        env:
          GH_TOKEN: ${{ secrets.GITHUB_TOKEN }}
          # Define unique cache prefixes for deletion
          CACHE_PREFIX_LIST: "codeql-trap- sccache-sccache-"
        run: |
          # Install gh cache manager extension
          gh extension install actions/gh-actions-cache
          # ... for usage, flags and examples: $ gh actions-cache [ --help | list --help | delete --help ]
          # Define args for gh cache commands
          GH_LIST_ARGS="-B main -L 100 --order desc --sort created-at"
          GH_DELETE_ARGS="-B main --confirm"
          echo CACHE PREFIXES FOR CLEANING ... $CACHE_PREFIX_LIST
          # Generate current cache list for main, newest first (note: 100 cache entries is gh maximum)
          echo CACHE LIST BEFORE ...
          gh actions-cache list $GH_LIST_ARGS | tee CACHE_LIST
          # Generate corresponding list of cache keys for deletion - retain only the newest key for each prefix
          DELETE_LIST=$(for CACHE_PREFIX in $CACHE_PREFIX_LIST ; do grep -E -o "^${CACHE_PREFIX}[^[:space:]]+" CACHE_LIST | sed '1d' ; done)
          echo DELETIONS ...
          # Delete caches via keys in DELETE_LIST if not dryrun
          # TODO remove non-dryrun echo for live use
          for KEY in $DELETE_LIST ; do [ "${{ inputs.dryrun }}" = "true" ] && echo \[DRY RUN\] DELETING $KEY || echo gh actions-cache delete $GH_DELETE_ARGS $KEY ; done
          # Generate post-clean list
          echo CACHE LIST AFTER ...
          gh actions-cache list $GH_LIST_ARGS