Added workflow to delete untagged images.

.github/workflows/delete-untagged-images.yml

@@ -0,0 +1,22 @@
+name: Delete untagged GHCR images
+
+on:
+  workflow_dispatch: # Run manually from the Actions tab
+
+jobs:
+  cleanup:
+    name: Delete all untagged images
+    runs-on: ubuntu-latest
+
+    permissions:
+      packages: write
+      contents: read
+
+    steps:
+      - name: Delete untagged GHCR images
+        uses: actions/delete-package-versions@v5
+        with:
+          package-name: "umami" # 👈 change if your GHCR package name differs
+          package-type: "container"
+          delete-only-untagged-versions: true
+          min-versions-to-keep: 0