fix: leverage packer to use build-timestamp

Author: samrose

amazon-arm64-nix.pkr.hcl

@@ -118,7 +118,7 @@ source "amazon-ebssurrogate" "source" {
   profile = "${var.profile}"
   #access_key    = "${var.aws_access_key}"
   #ami_name = "${var.ami_name}-arm64-${formatdate("YYYY-MM-DD-hhmm", timestamp())}"
-  ami_name = var.base-image-nightly ? "${var.ami_name}-base-stage-1-nightly" : "${var.ami_name}-${var.postgres-version}-stage-1"
+  ami_name = var.base-image-nightly ? "${var.ami_name}-base-stage-1-${var.build-timestamp}-nightly" : "${var.ami_name}-${var.postgres-version}-stage-1"
   ami_virtualization_type = "hvm"
   ami_architecture = "arm64"
   ami_regions   = "${var.ami_regions}"

stage2-nix-psql.pkr.hcl

@@ -66,7 +66,7 @@ source "amazon-ebs" "ubuntu" {
   region        = "${var.region}"
   source_ami_filter {
     filters = {
-      name   = "${var.ami_name}-base-stage-1-nightly"
+      name   = "${var.ami_name}-base-stage-1-*-nightly"
       root-device-type    = "ebs"
       virtualization-type = "hvm"
     }