Update release.sh

release.sh

@@ -657,21 +657,18 @@ function publish_artifacts() {
 
 # Sets the github release with the highest semver to 'latest'
 function set_latest_to_highest_semver() {
-  # List latest release
-  local releases # don't combine with the line below, or $? will be 0
-  # Support tags in two formats
-  # - knative-v1.0.0
-  # - v1.0.0
-  releases="$(hub_tool -p release | cut -d '-' -f2)"
+  local last_version # don't combine with the line below, or $? will be 0
+  last_version="$(hub_tool -p release | cut -d'-' -f2 | grep '^v[0-9]\+\.[0-9]\+\.[0-9]\+$'| sort -r -V | head -1)"
   if ! [[ $? -eq 0 ]]; then
     abort "cannot list releases"
   fi
-  local last_version="$(echo "${releases}" | grep '^v[0-9]\+\.[0-9]\+\.[0-9]\+$' | sort -r -V | head -1)"
+
   local release_id # don't combine with the line below, or $? will be 0
   release_id="$(hub_tool api /repos/${ORG_NAME}/${REPO_NAME}/releases/tags/knative-${last_version} | jq .id)"
   if [[ $? -ne 0 ]]; then
     abort "cannot get relase id from github"
   fi
+
   hub_tool api --method PATCH /repos/knative/serving/releases/$release_id -F make_latest=true > /dev/null || abort "error settomg $last_version to 'latest'"
   echo "Github release ${last_version} set as 'latest'"
 }