Update release instructions

releasing/helpers.sh

@@ -0,0 +1,32 @@
+#!/usr/bin/env bash
+
+function createBranch {
+  branch=$1
+  title=$2
+  echo "Making branch $branch : \"$title\""
+  git branch -D $branch  # delete if it exists
+  git checkout -b $branch
+  git commit -a -m "$title"
+  git push -f origin $branch
+}
+
+function createPr {
+  gh pr create --title "$title" --body "ALLOW_MODULE_SPAN" --base master
+}
+
+function refreshMaster {
+  git checkout master
+  git fetch upstream
+  git rebase upstream/master
+}
+
+function testKustomizeRepo {
+  make prow-presubmit-check >& /tmp/k.txt
+  local code=$?
+  if [ $code -ne 0 ]; then
+    echo "**** FAILURE ******************"
+    tail /tmp/k.txt
+  else
+    echo "LGTM"
+  fi
+}