bootspec: add a specialisation test

[RaitoBezarius]

Description

This test is failing atm.

Checklist

• Built with cargo build
• Formatted with cargo fmt
• Linted with cargo clippy
• Ran tests with cargo test
• Added or updated relevant tests (leave unchecked if not applicable)
• Added or updated relevant documentation (leave unchecked if not applicable)

[cole-h]

The spec says that there must be an org.nixos.bootspec.v1 key under the specialisation name, and you're missing that; that's why it fails:

  "org.nixos.specialisation.v1": {
    // Each key in this object corresponds to a specialisation as defined by the `specialisation.<name>` NixOS option.
    "<name>": {
      "org.nixos.bootspec.v1": {
        // See above
      }
    }
  },

Suggested change

	"org.nixos.specialisation.v1": {
	"variant": {
	"init": "/nix/store/4z5jmmhdvhyrpw08ic05bsb3hnbf365w-nixos-system-machine-23.05pre-git/init",
	"initrd": "/nix/store/kqv7bsb9ji7yhknim3laviz37b6smn2b-initrd-linux-6.1.25/initrd",
	"initrdSecrets": "/nix/store/f3kvscyhly5p8qybcmcgs0rj9lr3zplj-append-initrd-secrets/bin/append-initrd-secrets",
	"kernel": "/nix/store/v5j1pn8nd7h3i0w6kg1fpsa0mlxcgda4-linux-6.1.25/bzImage",
	"kernelParams": [
	"console=ttyS0",
	"panic=1",
	"boot.panic_on_fail",
	"clock=acpi_pm",
	"loglevel=7",
	"net.ifnames=0"
	],
	"label": "NixOS Stoat 23.05pre-git (Linux 6.1.25)",
	"system": "x86_64-linux",
	"toplevel": "/nix/store/4z5jmmhdvhyrpw08ic05bsb3hnbf365w-nixos-system-machine-23.05pre-git"
	}
	}
	"org.nixos.specialisation.v1": {
	"variant": {
	"org.nixos.bootspec.v1": {
	"init": "/nix/store/4z5jmmhdvhyrpw08ic05bsb3hnbf365w-nixos-system-machine-23.05pre-git/init",
	"initrd": "/nix/store/kqv7bsb9ji7yhknim3laviz37b6smn2b-initrd-linux-6.1.25/initrd",
	"initrdSecrets": "/nix/store/f3kvscyhly5p8qybcmcgs0rj9lr3zplj-append-initrd-secrets/bin/append-initrd-secrets",
	"kernel": "/nix/store/v5j1pn8nd7h3i0w6kg1fpsa0mlxcgda4-linux-6.1.25/bzImage",
	"kernelParams": [
	"console=ttyS0",
	"panic=1",
	"boot.panic_on_fail",
	"clock=acpi_pm",
	"loglevel=7",
	"net.ifnames=0"
	],
	"label": "NixOS Stoat 23.05pre-git (Linux 6.1.25)",
	"system": "x86_64-linux",
	"toplevel": "/nix/store/4z5jmmhdvhyrpw08ic05bsb3hnbf365w-nixos-system-machine-23.05pre-git"
	}
	}
	}