Don't set latest release when not publishing to GH

release.sh

@@ -662,14 +662,14 @@ function set_latest_to_highest_semver() {
     return 0
   fi
   echo "Setting latest release to highest semver"
-  
+
   local last_version release_id  # don't combine with assignment else $? 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 ! [[ $? -eq 0 ]]; then
     abort "cannot list releases"
   fi
-  
+
   release_id="$(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"