echo -n '5OUDHUlU9bJ2A6LtPzmFnD9IgHW6CyjB' | base64

apiVersion: v1
kind: Secret
metadata:
  name: argocd-secret
data:
  ...
  oidc.keycloak.clientSecret: c2Vrb0lFbmJEckNZb2pYMWZOZFRNdmVDckREbkdOYk8=
  ...