cleanup docker images

.github/workflows/cleanup-dangling-images.yml

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+name: Cleanup dangling container images
+
+on:
+  workflow_dispatch:
+    inputs:
+      dry_run:
+        description: "Preview only (do not delete image versions)"
+        type: boolean
+        default: false
+
+# Share this lock with publishing and the other cleanup workflow.
+concurrency:
+  group: ghcr-images
+  cancel-in-progress: false
+
+jobs:
+  cleanup:
+    runs-on: ubuntu-latest
+    timeout-minutes: 120
+    permissions:
+      packages: write
+    steps:
+      # Untagged architecture manifests can still belong to a tagged image.
+      - name: Delete untagged and unreferenced versions
+        uses: dataaxiom/ghcr-cleanup-action@d52806a0dc70b430571a37da1fde39733ffd640f # v1.2.2
+        with:
+          delete-untagged: true
+          dry-run: ${{ inputs.dry_run }}

.github/workflows/cleanup-sha-images.yml

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+name: Cleanup sha- container images
+
+on:
+  workflow_dispatch:
+    inputs:
+      dry_run:
+        description: "Preview only (do not delete image versions)"
+        type: boolean
+        default: false
+
+# Share this lock with publishing and the other cleanup workflow.
+concurrency:
+  group: ghcr-images
+  cancel-in-progress: false
+
+jobs:
+  cleanup:
+    runs-on: ubuntu-latest
+    timeout-minutes: 120
+    permissions:
+      packages: write
+    steps:
+      # The repository needs Admin access under the package's Manage Actions access.
+      - name: Delete versions with only sha- tags
+        uses: dataaxiom/ghcr-cleanup-action@d52806a0dc70b430571a37da1fde39733ffd640f # v1.2.2
+        with:
+          use-regex: true
+          delete-tags: '^sha-'
+          # Preserve every non-sha- tag. The colon check avoids matching digests.
+          exclude-tags: '^(?!sha-)[^:]+$'
+          delete-untagged: false
+          dry-run: ${{ inputs.dry_run }}