Add XControl image readiness check workflow (#778)

.github/workflows/check-xcontrol-image.yaml

@@ -0,0 +1,49 @@
+name: Check XControl Image Ready
+
+on:
+  workflow_dispatch:
+    inputs:
+      tag:
+        required: false
+        default: latest
+
+permissions:
+  contents: read
+  packages: read
+
+jobs:
+  check:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Authenticate to GHCR
+        env:
+          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+        run: |
+          echo "$GITHUB_TOKEN" | docker login ghcr.io -u "${{ github.actor }}" --password-stdin
+
+      - name: Check images exist and are pullable
+        env:
+          TAG: ${{ inputs.tag }}
+        run: |
+          set -euo pipefail
+
+          IMAGES=(
+            "ghcr.io/cloud-neutral-toolkit/openresty-geoip"
+            "ghcr.io/cloud-neutral-toolkit/postgres-runtime"
+            "ghcr.io/cloud-neutral-toolkit/account"
+            "ghcr.io/cloud-neutral-toolkit/dashboard"
+            "ghcr.io/cloud-neutral-toolkit/rag-server"
+            "ghcr.io/cloud-neutral-toolkit/xcontrol-init"
+            "docker.io/cloudneutral/openresty-geoip"
+            "docker.io/cloudneutral/postgres-runtime"
+            "docker.io/cloudneutral/account"
+            "docker.io/cloudneutral/dashboard"
+            "docker.io/cloudneutral/rag-server"
+            "docker.io/cloudneutral/xcontrol-init"
+          )
+
+          for IMAGE in "${IMAGES[@]}"; do
+            echo "Checking ${IMAGE}:${TAG}"
+            docker manifest inspect "${IMAGE}:${TAG}" > /dev/null
+            docker pull "${IMAGE}:${TAG}" > /dev/null
+          done