change image-file reference to null-resource using curl

Signed-off-by: Andre Licht <al@cloudeteer.de>

Author: lixhunter

prod-stackit/terraform/50_projects/team-iac-test01/modules/firewall/main.tf

@@ -1,15 +1,30 @@
+# Local copy of the Image
+resource "null_resource" "pfsense_image_file" {
+  triggers = {
+    always_run = timestamp()
+  }
+
+  provisioner "local-exec" {
+    command = "curl -o pfsense.qcow2 https://pfsense.object.storage.eu01.onstackit.cloud/pfsense-ce-2.7.2-amd64-10-12-2024.qcow2"
+  }
+  lifecycle {
+    ignore_changes = all
+  }
+}
+
 resource "stackit_image" "this" {
   project_id = var.project_id
   labels     = var.labels
 
-  name            = "pfsense-ce-2.7.2-amd64-10-12-2024_stackit_image"
   disk_format     = "qcow2"
-  local_file_path = "${path.module}/pfsense-ce-2.7.2-amd64-10-12-2024.qcow2"
-
+  name            = "pfsense-2.7.2-amd64-image"
+  local_file_path = "./pfsense.qcow2"
   config = {
     # UEFI must be disabled for this image to boot correctly
     uefi = false
   }
+
+  depends_on      = [null_resource.pfsense_image_file]
 }
 
 resource "stackit_server" "this" {