tools/appsre-build-worker-packer: Add image_users variable

packer will share the ami with those users.

templates/packer/composer.pkr.hcl

@@ -37,6 +37,9 @@ source "amazon-ebs" "image_builder" {
   # Set a name for the resulting AMI.
   ami_name = "${var.image_name}"
 
+  # Share the resulting AMI with accounts
+  ami_users = "${var.image_users}"
+
   # Network configuration for the instance building our image.
   associate_public_ip_address = true
   ssh_interface = "public_ip"

templates/packer/variables.pkr.hcl

@@ -15,6 +15,11 @@ variable "osbuild_commit" { type = string }
 
 # The name of the resulting AMI and the underlying EBS snapshot
 variable "image_name" { type = string }
+# A list of users to share the AMI with
+variable "image_users" {
+  type = list(string)
+  default = []
+}
 
 # Skip ansible tags
 variable "ansible_skip_tags" {