[fix] ci: missing container (#5263)

This workflow is no longer needed.

.github/workflows/cleanup.yml

@@ -1,37 +0,0 @@
----
-name: Cleanup
-
-# yamllint disable-line rule:truthy
-on:
-  workflow_dispatch:
-  schedule:
-    - cron: "4 4 * * *"
-
-concurrency:
-  group: ${{ github.workflow }}
-  cancel-in-progress: false
-
-permissions:
-  contents: read
-
-jobs:
-  registry:
-    # FIXME: On forks it fails with "Failed to fetch packages: missing field `id` at line 1 column 141"
-    if: github.repository_owner == 'searxng' || github.event_name == 'workflow_dispatch'
-    name: Registry
-    runs-on: ubuntu-24.04
-    permissions:
-      # Organization GHCR
-      packages: write
-
-    steps:
-      - name: Prune
-        uses: snok/container-retention-policy@3b0972b2276b171b212f8c4efbca59ebba26eceb  # v3.0.1
-        with:
-          account: "${{ github.repository_owner }}"
-          token: "${{ secrets.GITHUB_TOKEN }}"
-          # Remove only cache images https://github.com/snok/container-retention-policy/issues/97
-          image-names: "cache"
-          image-tags: "!searxng*"
-          cut-off: "1d"
-          keep-n-most-recent: "30"