check-remote-image-existence.sh: add space to |

Signed-off-by: Norio Nomura <norio.nomura@gmail.com>

hack/check-remote-image-existence.sh

@@ -5,7 +5,7 @@ set -eu -o pipefail
 script_dir=$(dirname "$0")
 
 result=0
-for template in $(realpath "${script_dir}"/../examples/*.yaml "${script_dir}"/./test-templates/*.yaml|sort -u); do
+for template in $(realpath "${script_dir}"/../examples/*.yaml "${script_dir}"/./test-templates/*.yaml | sort -u); do
 	for location in $(yq eval '.images[].location' "${template}"); do
 		if [[ ${location} == http* ]]; then
 			response=$(curl -L -s -I -o /dev/null -w "%{http_code}" "${location}")