feat(ci): clean up images older than 90 days (#278)

.github/workflows/cleanup.yml

@@ -0,0 +1,24 @@
+name: Cleanup Old Images
+on:
+  schedule:
+    - cron: "30 0 * * 0" # 0030 UTC on Sundays
+  workflow_dispatch:
+
+concurrency:
+  group: ${{ github.workflow }}-${{ github.ref || github.run_id }}
+
+jobs:
+  delete-older-than-90:
+    runs-on: ubuntu-latest
+    permissions:
+      packages: write
+    steps:
+      - name: Delete Images Older Than 90 Days
+        uses: dataaxiom/[email protected]
+        with:
+          token: ${{ secrets.GITHUB_TOKEN }}
+          packages: akmods,akmods-zfs,akmods-extra,akmods-nvidia-open
+          older-than: 90 days
+          delete-orphaned-images: true
+          keep-n-tagged: 7
+          keep-n-untagged: 7