Testomg ext4 instead of btrfs

nixos/hosts/osaka-vultr-01/disks.nix

@@ -25,25 +25,12 @@
             name = "crypted";
             extraOpenArgs = [ "--allow-discards" ];
             content = {
-              type = "btrfs";
-              extraArgs = [ "-f" ];
-              subvolumes = {
-                "/root" = {
+              type = "filesystem";
+              format = "ext4";
               mountpoint = "/";
-                  mountOptions = [ "compress=zstd" "noatime" ];
-                }; # root
-                "/home" = {
-                  mountpoint = "/home";
-                  mountOptions = [ "compress=zstd" "noatime" ];
-                }; # home
-                "/nix" = {
-                  mountpoint = "/nix";
-                  mountOptions = [ "compress=zstd" "noatime" ];
-                }; # nix
-              }; # subvolumes
-            };# content
-          }; # content
-        }; # luks.partitions
+            };
+          };
+        };
       }; # partitions
     }; # content
   }; # disko.devices.disk.vda