sync script should only be ran on r9s

sync-from-upstream

@@ -4,6 +4,12 @@ if [ -z $1  ]; then
   HOWMANY="-1"
 fi
 
+BRANCH=$(git branch --show-current)
+if [[ ! "${BRANCH}" =~ "r9s" ]]; then
+  echo "Not a lookahead branch."
+  exit 1
+fi
+
 echo "Fetching from upstream"
 git fetch https://gitlab.com/redhat/centos-stream/release-engineering/module-defaults.git c9s
 echo "Formatting patch and applying..."