Create images-cleanup.yml

Clean up untagged images from the 'ledgersmb' package repo

.github/workflows/images-cleanup.yml

@@ -0,0 +1,18 @@
+name: Docker Image cleanup
+
+on:
+  push:
+  workflow_dispatch:
+  schedule:
+    # Schedule for five minutes after the hour, every Friday
+    - cron: '10 3 * * 5'
+
+jobs:
+  cleanup:
+    if: github.repository_owner == 'ledgersmb'
+    runs-on: ubuntu-latest
+    steps:
+    - name: ghcr.io cleanup action
+      uses: dataaxiom/ghcr-cleanup-action@v1
+      with:
+        packages: ledgersmb