Initial commit: krops-lamassu deployment template

NixOS deployment template for Lamassu Bitcoin ATM server using
nix-bitcoin and krops.

Features:
- Lamassu server with PostgreSQL and auto-generated secrets
- TLS certificates (self-signed)
- Test VM for local development
- Template structure for easy customization

example/config/hardware-configuration.nix

@@ -0,0 +1,45 @@
+# Hardware configuration
+#
+# FIXME: Replace this file with the output of 'nixos-generate-config --show-hardware-config'
+# run on your target machine.
+#
+# This is a placeholder that should work for most x86_64 systems.
+
+{ config, lib, pkgs, modulesPath, ... }:
+
+{
+  imports = [
+    (modulesPath + "/installer/scan/not-detected.nix")
+  ];
+
+  # FIXME: Adjust kernel modules for your hardware
+  boot.initrd.availableKernelModules = [ "ahci" "xhci_pci" "virtio_pci" "sd_mod" "sr_mod" ];
+  boot.initrd.kernelModules = [ ];
+  boot.kernelModules = [ "kvm-intel" "kvm-amd" ];
+  boot.extraModulePackages = [ ];
+
+  # FIXME: Set your filesystem configuration
+  # Use 'blkid' or 'lsblk -f' to find UUIDs
+  fileSystems."/" = {
+    device = "/dev/disk/by-uuid/XXXXXXXX-XXXX-XXXX-XXXX-XXXXXXXXXXXX";
+    fsType = "ext4";
+  };
+
+  fileSystems."/boot" = {
+    device = "/dev/disk/by-uuid/XXXX-XXXX";
+    fsType = "vfat";
+  };
+
+  # FIXME: Set swap device if needed
+  # swapDevices = [
+  #   { device = "/dev/disk/by-uuid/XXXXXXXX-XXXX-XXXX-XXXX-XXXXXXXXXXXX"; }
+  # ];
+
+  # FIXME: Set your platform (x86_64-linux, aarch64-linux, etc.)
+  nixpkgs.hostPlatform = lib.mkDefault "x86_64-linux";
+
+  # For Intel CPUs:
+  # hardware.cpu.intel.updateMicrocode = lib.mkDefault config.hardware.enableRedistributableFirmware;
+  # For AMD CPUs:
+  # hardware.cpu.amd.updateMicrocode = lib.mkDefault config.hardware.enableRedistributableFirmware;
+}