Add GitHub Action to delete old packages

https://github.com/actions/delete-package-versions

.github/workflows/clean-up.yml

@@ -0,0 +1,29 @@
+name: Delete old packages
+
+on:
+  schedule:
+    - cron: '20 8 * * *'  # 8:20am everyday
+  pull_request:
+    branches:
+      - main
+  push:
+    branches:
+      - main
+  workflow_dispatch:
+
+env:
+  PKG_NAME: ${{ github.event.repository.name }}
+
+jobs:
+  clean:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout repository
+        uses: actions/checkout@v4
+
+      - name: Delete old packages
+        uses: actions/delete-package-versions@v5
+        with:
+          package-name: ${{ env.PKG_NAME }}
+          package-type: 'container'
+          min-versions-to-keep: 20