add sap secret generator controller to argocd deployment

oci-managed/argocd/secret-generator.tf

@@ -0,0 +1,10 @@
+resource "helm_release" "secret-generator" {
+  namespace        = var.namespace
+  create_namespace = true
+  name             = "secret-generator"
+  repository       = "oci://ghcr.io/sap/secret-generator-helm"
+  chart            = "secret-generator"
+  cleanup_on_fail  = true
+
+  timeout = var.timeout_seconds
+}