ci: sync release/2.1.x to charts (#3415)

Author: pmalek

.github/workflows/charts-sync.yaml

@@ -13,7 +13,7 @@ on:
       - .github/charts-sync.yaml
       - .github/workflows/charts-sync.yaml
     branches:
-      - main
+      - release/2.1.x
   workflow_dispatch:
 
 permissions: