tf/keycloak: add "Configure OTP" to default actions

When signing into GitLab, opting to create a new keycloak account
results in being able to sign into GitLab without setting up OTP.

Since any subsequent login will require configuring OTP, it seems
well advised to prompt for it as part of the registration process.

tf-stage2/keycloak.tf

@@ -138,11 +138,12 @@ resource "keycloak_required_action" "custom-terms-and-conditions" {
 }
 
 resource "keycloak_required_action" "configure_otp" {
-  realm_id = "archlinux"
-  alias    = "CONFIGURE_TOTP"
-  enabled  = true
-  name     = "Configure OTP"
-  priority = 0
+  realm_id       = "archlinux"
+  alias          = "CONFIGURE_TOTP"
+  default_action = true
+  enabled        = true
+  name           = "Configure OTP"
+  priority       = 0
 }
 
 resource "keycloak_required_action" "update_password" {