Add deployment expr for morph for the rest

clusters/psql1/default.nix

@@ -1,9 +1,16 @@
-with import <nixpkgs> {};
 let
+  # Pin the deployment package-set to a specific version of nixpkgs
+  # pkgs = import (builtins.fetchTarball {
+  #   url = "https://github.com/NixOS/nixpkgs/archive/e9148dc1c30e02aae80cc52f68ceb37b772066f3.tar.gz";
+  #   sha256 = "1ckzhh24mgz6jd1xhfgx0i9mijk6xjqxwsshnvq789xsavrmsc36";
+  # }) {};
+  pkgs = import <nixpkgs> {};
+
   name = "psql1-0";
   address = "10.1.30.80";
 in {
-  psql1-0 = {
+  psql1-0 = { config, pkgs, ... }: with pkgs; {
+    deployment.tags = [ "db" ];
     deployment.targetHost = address;
     system.autoUpgrade.enable = lib.mkForce false;