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/boot.nix

@@ -0,0 +1,17 @@
+# Bootloader configuration
+#
+# FIXME: Uncomment the appropriate bootloader for your system
+
+{
+  # For UEFI systems (most modern hardware)
+  # boot.loader.systemd-boot.enable = true;
+  # boot.loader.efi.canTouchEfiVariables = true;
+
+  # For Legacy BIOS/MBR systems (e.g., Lunanode VPS with /dev/vda)
+  # boot.loader.grub.enable = true;
+  # boot.loader.grub.device = "/dev/vda";
+
+  # For Legacy BIOS/MBR systems (e.g., bare metal with /dev/sda)
+  # boot.loader.grub.enable = true;
+  # boot.loader.grub.device = "/dev/sda";
+}