Fix output usage in push action

hack/build/ci/upload-docker-image.sh

@@ -23,9 +23,8 @@ srcImage=$(docker load -i "${imageTarPath}" | cut -d' ' -f3)
 
 docker load --input "${imageTarPath}"
 docker tag "${srcImage}" "${targetImage}"
-docker push "${targetImage}"
+imageinfo=$(docker push "${targetImage}")
 
 # filtering by image-tag directly does not work currently see: https://github.com/moby/moby/issues/29901
-digest=$(docker images --digests --format "{{.Repository}}:{{.Tag}}@{{.Digest}}" | grep "${targetImage}" | cut -d '@' -f 2)
-
+digest=$(echo "$imageinfo" | cut -d " " -f 3)
 echo "digest=${digest}">> "$GITHUB_OUTPUT"