refactor: use activation script to sync containers folder

modules/common/podman.nix

@@ -1,29 +1,14 @@
 { config, lib, pkgs, ... }:
-
-let
-  nginxQuadlet = pkgs.writeText "nginx-example.container" ''
-    [Container]
-    Image=nginx:latest
-    PublishPort=9999:80
-
-    [Service]
-    Restart=always
-
-    [Install]
-    WantedBy=default.target
-  '';
-in
 {
-  virtualisation.podman = {
-    enable = true;
-    # Rootless containers via user quadlets
-  };
+  virtualisation.podman.enable = true;
 
-  # Write quadlet files into the containers user's config directory
-  systemd.tmpfiles.rules = [
-    "d /var/lib/containers/.config 0755 containers containers -"
-    "d /var/lib/containers/.config/containers 0755 containers containers -"
-    "d /var/lib/containers/.config/containers/systemd 0755 containers containers -"
-    "L+ /var/lib/containers/.config/containers/systemd/nginx-example.container - - - - ${nginxQuadlet}"
-  ];
+  # Sync everything in ./containers/ to the containers user's quadlet directory
+  system.activationScripts.containers-quadlets = {
+    text = ''
+      mkdir -p /var/lib/containers/.config/containers/systemd
+      cp -r ${./containers}/* /var/lib/containers/.config/containers/systemd/
+      chown -R containers:containers /var/lib/containers/.config
+    '';
+    deps = [ "users" ];
+  };
 }