feat: add containers system user for rootless podman

modules/common/users.nix

@@ -18,6 +18,18 @@
     home = "/home/deploy";
   };
 
+  users.users.containers = {
+    isSystemUser = true;
+    group = "containers";
+    extraGroups = [ "podman" ];
+    home = "/var/lib/containers";
+    createHome = true;
+    subUidRanges = [{ startUid = 100000; count = 65536; }];
+    subGidRanges = [{ startGid = 100000; count = 65536; }];
+    linger = true;
+  };
+  users.groups.containers = {};
+
   security.sudo.extraRules = [
     {
       users = [ "phoenix" "deploy" ];