Could someone please help me troubleshoot this? Should one of the commands in the install script be run with sudo or something?

I'm running into this error when trying to use disko to create a bootable USB (sudo nix run 'github:nix-community/disko/latest#disko-install' -- --flake '.#image' --disk nixos-usb-stick /dev/sdc):

Creating initial /etc/machine-id
efiSysMountPoint = '/boot' is not a mounted partition. Is the path configured correctly?
Traceback (most recent call last):
  File "/nix/store/diy6lcklb9r4k18l6plg6yj9chn3pg19-systemd-boot/bin/systemd-boot", line 431, in <module>
    main()
  File "/nix/store/diy6lcklb9r4k18l6plg6yj9chn3pg19-systemd-boot/bin/systemd-boot", line 411, in main
    run([CHECK_MOUNTPOINTS])
  File "/nix/store/diy6lcklb9r4k18l6plg6yj9chn3pg19-systemd-boot/bin/systemd-boot", line 58, in run
    return subprocess.run(cmd, check=True, text=True, stdout=stdout)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/nix/store/c9m6yd8fg1flz2j5r4bif1ib5j20a0cy-python3-3.12.8/lib/python3.12/subprocess.py", line 571, in run
    raise CalledProcessError(retcode, process.args,
subprocess.CalledProcessError: Command '['/nix/store/686vaqa40l0vxcp1ll54cbvlrmn9kn55-check-mountpoints']' returned non-zero exit status 1.
Failed to install bootloader
disko-install failed
rmdir: failed to remove '/mnt/disko-install-root': Directory not empty

The disko config is:

{
  disko.devices = {
    nodev."/" = {
      fsType = "tmpfs";
      mountOptions = [
        "size=2G"
        "defaults"
        "mode=755"
      ];
    };
    nodev."/home/raj" = {
      fsType = "tmpfs";
      mountOptions = [
        "size=2G"
        "defaults"
        "mode=777"
      ];
    };
    disk = {
      nixos-usb-stick = {
        type = "disk";
        content = {
          type = "gpt";
          partitions = {
            ESP = {
              type = "EF00";
              priority = 0;
              end = "1G";
              content = {
                type = "filesystem";
                format = "vfat";
                mountpoint = "/boot";
                mountOptions = ["defaults" "umask=0077"];
              };
            };
            root = {
              priority = 1;
              end = "-0";
              content = {
                type = "luks";
                name = "root";
                initrdUnlock = true;
                extraFormatArgs = ["--pbkdf argon2id"];
                content = {
                  type = "btrfs";
                  extraArgs = ["-f"];
                  subvolumes = {
                    "/nix" = {
                      mountpoint = "/nix";
                      mountOptions = ["compress=zstd" "noatime"];
                    };
                    "/persist" = {
                      mountpoint = "/persist";
                      mountOptions = ["compress=zstd" "noatime"];
                    };
                    "/data" = {
                      mountpoint = "/data";
                      mountOptions = ["compress=zstd" "noatime"];
                    };
                  };
                };
              };
            };
          };
        };
      };
    };
  };
}

I really want to avoid blowing up my computer.

Hello, I have a quick doubt: I want to add a BTRFS subvol to my system. I modified the disko coinfig in my flake, how should I apply those changes?

In reply to @guiniol:matrix.org
So. I wanted to create a couple of extra datasets in an existing ZFS pool without wiping everything. Is there a way to either get disko to not remove existing data (is this what the mount mode does? I couldn't find much about it in the docs) or to get disko to give me the commands it would run to create those datasets (which I would the run myself).