feat: implemented ignore_difference option

Signed-off-by: leonsteinhaeuser <[email protected]>

main.tf

@@ -101,6 +101,19 @@ resource "argocd_application_set" "this" {
           }
         }
 
+        dynamic "ignore_difference" {
+          // to protect against null values, we need to check if the ignore_difference block is not null
+          for_each = var.ignore_difference != null ? var.ignore_difference : []
+          content {
+            group               = ignore_difference.value.group
+            jq_path_expressions = ignore_difference.value.jq_path_expressions
+            json_pointers       = ignore_difference.value.json_pointers
+            kind                = ignore_difference.value.kind
+            name                = ignore_difference.value.name
+            namespace           = ignore_difference.value.namespace
+          }
+        }
+
         destination {
           name = "{{ if (eq ${local.cluster_identifier} \"general-purpose\") }}in-cluster{{ else }}{{ ${local.cluster_identifier} }}{{ end }}"
           // if the target_namespace_overwrite is not empty, then we want to use it as the namespace

variables.tf

@@ -155,3 +155,16 @@ variable "sync_policy" {
   description = "ArgoCD sync policy configuration"
   default     = null
 }
+
+variable "ignore_difference" {
+  type = list(object({
+    group               = optional(string)
+    jq_path_expressions = optional(list(string))
+    json_pointers       = optional(list(string))
+    kind                = optional(string)
+    name                = optional(string)
+    namespace           = optional(string)
+  }))
+  description = "A list of object kinds to ignore during the diff process. This is useful if you want to ignore certain differences between the application set and the cluster. e.g. if you want to ignore differences in the namespace labels."
+  default     = []
+}