fix: Resolve error on build caused by systemd-machine-id-commit.servi…

…ce trigger

The bind mount creation for `/etc/machine-id` by `impermanence` is unintentionally triggering `systemd-machine-id-commit.service`, causing an error.
This commit resolves this issue, see: nix-community/impermanence#229.
And NixOS/nixpkgs#351151 for details.

flake.nix

@@ -6,7 +6,7 @@
     #================================Nix Packages collection & NixOS==============================#
     #-----------Official NixOS package source, using nixos's unstable branch by default-----------#
     nixpkgs.url = "github:nixos/nixpkgs/nixos-unstable";
-    #-------------------------Simplify Nix Flakes with the module system--------------------------#
+    #=========================Simplify Nix Flakes with the module system==========================#
     flake-parts.url = "github:hercules-ci/flake-parts";
     #===================Declarative disk partitioning and formatting using nix====================#
     disko = {

impermanence.nix

@@ -11,6 +11,15 @@ in
     pkgs.ncdu
   ];
 
+  # issue: https://github.com/nix-community/impermanence/issues/229
+  # Use symlink
+  systemd.tmpfiles.rules = [
+    "L /etc/machine-id - - - - /persist/etc/machine-id"
+  ];
+  # Or
+  # boot.initrd.systemd.suppressedUnits = [ "systemd-machine-id-commit.service" ];
+  # systemd.suppressedSystemUnits = [ "systemd-machine-id-commit.service" ];
+
   # There are two ways to clear the root filesystem on every boot:
   ##  1. use tmpfs for /
   ##  2. (btrfs/zfs only)take a blank snapshot of the root filesystem and revert to it on every boot via:
@@ -45,7 +54,7 @@ in
       # "/usr/share/icons"
     ];
     files = [
-      "/etc/machine-id"
+      #"/etc/machine-id"
       "/etc/create-ap.conf"
     ];