Add check image exists

hack/verify-image.sh

@@ -0,0 +1,15 @@
+#!/usr/bin/env bash
+
+patch_url=$1
+
+file=mirror.txt
+
+cp "${file}" "${file}.bak"
+
+git apply -R <(curl -fsSL "${patch_url}")
+
+list=$(diff --unified "${file}" "${file}.bak" | grep -e '^+\w' | sed 's/^+//')
+
+for image in ${list}; do
+    skopeo inspect --raw "docker://${image}" || { echo "Not Found ${image}" ; exit 1; }
+done