Add workflow to prune old GHCR images

This workflow allows for manual execution to prune old images from the GitHub Container Registry, keeping the latest and a specified number of tagged images.

.github/workflows/prune.yml

@@ -0,0 +1,21 @@
+name: Prune Old GHCR Images
+
+on:
+  #schedule:
+  #  - cron: '0 0 * * 0' # Runs at 00:00 every Sunday
+  workflow_dispatch:   # Allows you to run it manually from the Actions tab
+
+jobs:
+  prune:
+    runs-on: ubuntu-latest
+    permissions:
+      packages: write
+    steps:
+      - name: Cleanup old images
+        uses: dataaxiom/ghcr-cleanup-action@cd0cdb900b5dbf3a6f2cc869f0dbb0b8211f50c4 # v1.0.16
+        with:
+          package: autoglue # Tell the action exactly which lowercase package to look for
+          exclude-tags: latest,main,v*
+          keep-n-tagged: 5
+          delete-untagged: true
+          delete-partial-images: true