add age encryption related scripts

scripts/4.add-age-key.sh

@@ -0,0 +1,7 @@
+#!/bin/bash
+set -e
+
+cat /mnt/nfs/agekey/age.agekey |
+kubectl create secret generic sops-age \
+--namespace=argocd \
+--from-file=age.agekey=/dev/stdin