Add support for image mirroring

docker/service/image.tf

@@ -0,0 +1,17 @@
+resource "docker_image" "mirror" {
+  count         = var.mirror != null ? 1 : 0
+  name          = data.docker_registry_image.image.name
+  pull_triggers = [data.docker_registry_image.image.sha256_digest]
+  force_remove  = false
+}
+resource "docker_tag" "mirror" {
+  count        = var.mirror != null ? 1 : 0
+  source_image = docker_image.mirror[0].name
+  target_image = var.mirror
+}
+resource "docker_registry_image" "mirror" {
+  count         = var.mirror != null ? 1 : 0
+  depends_on    = [docker_tag.mirror[0]]
+  name          = docker_tag.mirror[0].target_image
+  keep_remotely = true
+}

docker/service/inputs.tf

@@ -1,6 +1,11 @@
 variable "image" {
   type = string
 }
+variable "mirror" {
+  type        = string
+  default     = null
+  description = "Whether to mirror the image to the local registry. Value is the mirror location."
+}
 variable "command" {
   type    = list(string)
   default = null

docker/service/locals.tf

@@ -14,4 +14,7 @@ locals {
     "ooo.grey.service.image"        = data.docker_registry_image.image.name
     "ooo.grey.service.image.digest" = data.docker_registry_image.image.sha256_digest
   })
+
+  # Calculate the docker image to use
+  image = var.mirror != null ? "${docker_registry_image.mirror[0].name}@${docker_registry_image.mirror[0].sha256_digest}" : "${data.docker_registry_image.image.name}@${data.docker_registry_image.image.sha256_digest}"
 }

docker/service/service.tf

@@ -9,7 +9,7 @@ resource "docker_service" "instance" {
   # Define the task spec
   task_spec {
     container_spec {
-      image   = "${data.docker_registry_image.image.name}@${data.docker_registry_image.image.sha256_digest}"
+      image   = local.image
       command = var.command
       env     = var.environment_variables