check-remote-image-existence.sh: exit 1 if any image does not exist

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

hack/check-remote-image-existence.sh

@@ -4,16 +4,20 @@ set -eu -o pipefail
 # Get the directory of the script
 script_dir=$(dirname "$0")
 
+result=0
 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}")
             if [[ ${response} != "200" ]]; then
                 line=$(grep -n "${location}" "${template}" | cut -d ':' -f 1)
                 echo "::error file=${template},line=${line}::response: ${response} for ${location}"
+                result=1
             else
                 echo "response: ${response} for ${location}"
             fi
         fi
     done
 done
+
+exit "${result}"