ci: fix image dest during copy (#552)

Signed-off-by: Ramkumar Chinchani <[email protected]>

.github/workflows/sync-3rdparty-images.yaml

@@ -27,7 +27,7 @@ jobs:
         run: |
           set -e
           for n in ubuntu:latest alpine:edge centos:latest busybox:latest; do
-            dest="${{ github.repository_owner }}/$n"
+            dest="ghcr.io/${{ github.repository_owner }}/$n"
             docker trust inspect "$n"
             docker pull $n
             docker tag $n "$dest"