feat: Add cache_from option in the docker-build module (#641)

Co-authored-by: Anton Babenko <[email protected]>

Author: jean-simon-barry1

examples/container-image/main.tf

@@ -127,6 +127,8 @@ module "docker_build_from_ecr" {
   triggers = {
     dir_sha = local.dir_sha
   }
+
+  cache_from = ["${module.ecr.repository_url}:latest"]
 }
 
 module "ecr" {

modules/docker-build/README.md

@@ -91,6 +91,7 @@ No modules.
 | Name | Description | Type | Default | Required |
 |------|-------------|------|---------|:--------:|
 | <a name="input_build_args"></a> [build\_args](#input\_build\_args) | A map of Docker build arguments. | `map(string)` | `{}` | no |
+| <a name="input_cache_from"></a> [cache\_from](#input\_cache\_from) | List of images to consider as cache sources when building the image. | `list(string)` | `[]` | no |
 | <a name="input_create_ecr_repo"></a> [create\_ecr\_repo](#input\_create\_ecr\_repo) | Controls whether ECR repository for Lambda image should be created | `bool` | `false` | no |
 | <a name="input_create_sam_metadata"></a> [create\_sam\_metadata](#input\_create\_sam\_metadata) | Controls whether the SAM metadata null resource should be created | `bool` | `false` | no |
 | <a name="input_docker_file_path"></a> [docker\_file\_path](#input\_docker\_file\_path) | Path to Dockerfile in source package | `string` | `"Dockerfile"` | no |

modules/docker-build/main.tf

@@ -17,6 +17,7 @@ resource "docker_image" "this" {
     dockerfile = var.docker_file_path
     build_args = var.build_args
     platform   = var.platform
+    cache_from = var.cache_from
   }
 
   force_remove = var.force_remove

modules/docker-build/variables.tf

@@ -112,3 +112,9 @@ variable "triggers" {
   type        = map(string)
   default     = {}
 }
+
+variable "cache_from" {
+  description = "List of images to consider as cache sources when building the image."
+  type        = list(string)
+  default     = []
+}

wrappers/docker-build/main.tf

@@ -4,6 +4,7 @@ module "wrapper" {
   for_each = var.items
 
   build_args                = try(each.value.build_args, var.defaults.build_args, {})
+  cache_from                = try(each.value.cache_from, var.defaults.cache_from, [])
   create_ecr_repo           = try(each.value.create_ecr_repo, var.defaults.create_ecr_repo, false)
   create_sam_metadata       = try(each.value.create_sam_metadata, var.defaults.create_sam_metadata, false)
   docker_file_path          = try(each.value.docker_file_path, var.defaults.docker_file_path, "Dockerfile")