fix: change registration auth by changing to token auth

Author: Christophe - CC4

applications/modules/vault/auth_registration.tf

@@ -1,17 +1,9 @@
-resource "vault_auth_backend" "registration-cert" {
-  path = "registration-cert"
-  type = "cert"
-}
+resource "vault_token_auth_backend_role" "registration-token" {
+  role_name    = "registration-token"
 
-resource "vault_cert_auth_backend_role" "registration-cert" {
-  name    = "registration-cert"
-  backend = vault_auth_backend.registration-cert.path
+  allowed_policies = [vault_policy.devices-policy.name]
+  renewable = false
 
-  certificate                  = vault_pki_secret_backend_intermediate_set_signed.registration_intermediate.certificate
-  allowed_organizational_units = ["Registration"]
-  allowed_common_names         = ["registration.${var.domain}"]
-
-  token_ttl      = 300
-  token_max_ttl  = 600
-  token_policies = [vault_policy.devices-policy.name]
+  token_ttl      = 31536000 # 1 year
+  token_max_ttl  = 31536000 # 1 year
 }