try to make the key optional as we might sometime use the full secret but for now it's not working

module.tf

@@ -25,7 +25,7 @@ variable "kubernetes" {
       value_from = optional(object({
         secret_key_ref = object({
           name = string
-          key  = string
+          key  = optional(string,null)
         })
       }))
       #      secret_name = optional(string)
@@ -207,6 +207,7 @@ resource "kubernetes_deployment_v1" "automatic" {
                     content {
                       name = env.value.value_from.secret_key_ref.name
                       key  = env.value.value_from.secret_key_ref.key
+                      optional = true
                     }
                   }
                 }

variables.auto.tfvars

@@ -36,8 +36,8 @@ kubernetes = {
       MY_VAR = {
         value_from = {
           secret_key_ref = {
-            name = "my_secret"
+            name = "mysecret"
-            key  = "latest"
+#            key  = "latest"
           }
         }
       }