Build machine config change and fixes, improve the dry running, move about the some configs when using builtin hardware-configuration.nix, and fix some syntax issues.

nix-system-configs/modules/system/database.nix

@@ -35,8 +35,8 @@
     ../lix-default.nix
     ../secrets-config/sops-database.nix
     ../system_scripts/gcloud_backup.nix
-    ./hardware-configuration.nix
-  ];
+    ## TODO: Make this more elegant and less risky for unexpected errors happening.
+] ++ lib.optional (builtins.pathExists ./hardware-configuration.nix) ./hardware-configuration.nix;
 
   config = {
     local.hostname = "nixosdd";