modularized all the things

part one (?)

modules/virtualization/podman.nix

@@ -1,7 +1,39 @@
-{...}: {
-  virtualisation.podman = {
-    enable = true;
-    dockerSocket.enable = true;
-    defaultNetwork.settings.dns_enabled = true;
+{
+  config,
+  lib,
+  pkgs,
+  ...
+}: let
+  cfg = config.containers;
+in {
+  options.containers = {
+    podman = {
+      enable = lib.mkEnableOption "Podman container runtime";
+      dockerCompat = lib.mkEnableOption "Enable Docker compatibility";
+      extraPackages = lib.mkOption {
+        type = lib.types.listOf lib.types.package;
+        default = [];
+        description = "Additional packages to install when Podman is enabled";
+      };
+    };
+  };
+
+  config = lib.mkIf cfg.podman.enable {
+    virtualisation.podman = {
+      enable = true;
+      dockerCompat = cfg.podman.dockerCompat;
+      enableOnBoot = true;
+      defaultNetwork.settings.dns_enabled = true;
+    };
+
+    environment.systemPackages =
+      [
+        pkgs.podman-compose
+        pkgs.buildah
+        pkgs.skopeo
+        pkgs.dive
+        pkgs.container-diff
+      ]
+      ++ cfg.podman.extraPackages;
   };
 }