Don't set latest release when not publishing to GH

release.sh

@@ -658,13 +658,18 @@ function publish_artifacts() {
 
 # Sets the github release with the highest semver to 'latest'
 function set_latest_to_highest_semver() {
-  local last_version # don't combine with the line below, or $? will be 0
+  if ! (( PUBLISH_TO_GITHUB )); then
+    return 0
+  fi
+  echo "Setting latest release to highest semver"
+
+  local last_version release_id
+
   last_version="$(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 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"
@@ -701,6 +706,8 @@ function main() {
   function_exists build_release || abort "function 'build_release()' not defined"
   [[ -x ${VALIDATION_TESTS} ]] || abort "test script '${VALIDATION_TESTS}' doesn't exist"
 
+  banner "Environment variables"
+  env
   # Log what will be done and where.
   banner "Release configuration"
   if which gcloud &>/dev/null ; then