feat(nginx-reverse-proxy): add custom error pages and update configuration for error handling

terraform/modules/apps/nginx-reverse-proxy/main.tf

@@ -102,6 +102,19 @@ resource "kubernetes_config_map" "nginx_default_config" {
   data = local.services_config
 }
 
+resource "kubernetes_config_map" "nginx_custom_50x_page" {
+
+  metadata {
+    name      = "nginx-errors"
+    namespace = kubernetes_namespace.reverse_proxy.metadata[0].name
+  }
+
+  data = {
+    for k, v in local.errors_pages : k => v
+  }
+
+}
+
 resource "kubernetes_config_map" "auth_script" {
   metadata {
     name      = "auth-script"
@@ -203,6 +216,7 @@ resource "kubernetes_deployment" "reverse_proxy" {
           "checksum/services"    = local.services_config_checksum
           "checksum/wireguard"   = local.wireguard_config_checksum
           "checksum/auth_server" = local.auth_script_checksum
+          "checksum/custom_50x"  = local.errors_pages_checksum
         }
       }
       spec {
@@ -360,6 +374,12 @@ resource "kubernetes_deployment" "reverse_proxy" {
             read_only  = true
           }
 
+          volume_mount {
+            name       = "nginx-errors"
+            mount_path = "/usr/share/nginx/html/errors"
+            read_only  = true
+          }
+
           dynamic "volume_mount" {
             for_each = length([for v in var.services : v.tls if v.tls == true]) > 0 ? [1] : []
             content {
@@ -411,6 +431,13 @@ resource "kubernetes_deployment" "reverse_proxy" {
           }
         }
 
+        volume {
+          name = "nginx-errors"
+          config_map {
+            name = kubernetes_config_map.nginx_custom_50x_page.metadata[0].name
+          }
+        }
+
         dynamic "volume" {
           for_each = length([for v in var.services : v.tls if v.tls == true]) > 0 ? [1] : []
           content {