move podman config to more suitable location

hosts/nixcloud/configuration.nix

@@ -14,6 +14,20 @@
     
   networking.hostName = "nixcloud"; # Define your hostname.
 
+  # podman
+  virtualisation.podman = {
+    enable = true;
+    autoPrune.enable = true;
+    dockerCompat = true;   # optional; lets you use `docker` CLI
+  };
+  virtualisation.oci-containers.backend = "podman";
+
+  # Enable container name DNS for all Podman networks.
+  networking.firewall.interfaces = let
+    matchAll = if !config.networking.nftables.enable then "podman+" else "podman*";
+  in {
+    "${matchAll}".allowedUDPPorts = [ 53 ];
+  };
 
   # Define a user account. Don't forget to set a password with ‘passwd’.
   users.users = {