Add mailcow to terraform

modules/services/main.tf

@@ -4,6 +4,10 @@ terraform {
       source = "goauthentik/authentik"
       version = "~> 2024.8.0"
     }
+    mailcow = {
+      source = "l-with/mailcow"
+      version = "~> 0.7.5"
+    }
     postgresql = {
       source = "cyrilgdn/postgresql"
       version = "~> 1.23.0"
@@ -15,4 +19,5 @@ locals {
   services_auth = {for key, val in var.services : key => val if val.auth}
   services_database = {for key, val in var.services : key => val if val.database}
   services_s3 = {for key, val in var.services : key => val if val.s3}
+  services_mail = {for key, val in var.services : key => val if val.mail != null}
 }