change docker to podman for arion compatibility

hosts/common/optional/docker/default.nix

@@ -1,10 +1,26 @@
-{pkgs, ...}: {
+{
+  pkgs,
+  inputs,
+  ...
+}: {
+  imports = [inputs.arion.nixosModules.arion];
+  environment.systemPackages = [
+    pkgs.arion
+    pkgs.docker-client
+  ];
+
   virtualisation = {
-    docker = {
+    podman = {
       enable = true;
+      dockerSocket.enable = true;
+      defaultNetwork.settings.dns_enabled = true;
     };
   };
-  environment.systemPackages = with pkgs; [
-    docker-compose
-  ];
+
+  environment.persistence."/persist" = {
+    hideMounts = true;
+    directories = [
+      "/var/lib/containers"
+    ];
+  };
 }