modules/nixos: add armv7l kernel personality patch

modules/nixos/common/armv7l.nix

@@ -0,0 +1,30 @@
+{
+  config,
+  lib,
+  pkgs,
+  ...
+}:
+# https://github.com/NixOS/aarch64-build-box/pull/133
+{
+  config =
+    lib.mkIf
+      (
+        lib.hasPrefix "build" config.networking.hostName
+        && pkgs.stdenv.hostPlatform.system == "aarch64-linux"
+      )
+      {
+        boot.kernelParams = [ "compat_uts_machine=armv7l" ];
+
+        boot.kernelPatches = [
+          {
+            patch = pkgs.fetchpatch {
+              name = "compat_uts_machine.patch";
+              url = "https://git.launchpad.net/~ubuntu-kernel/ubuntu/+source/linux/+git/jammy/patch/?id=c1da50fa6eddad313360249cadcd4905ac9f82ea";
+              hash = "sha256-357+EzMLLt7IINdH0ENE+VcDXwXJMo4qiF/Dorp2Eyw=";
+            };
+          }
+        ];
+
+        nix.settings.extra-platforms = [ "armv7l-linux" ];
+      };
+}

modules/nixos/common/default.nix

@@ -8,6 +8,7 @@
   imports = [
     ../../shared/known-hosts.nix
     ../../shared/nix-daemon.nix
+    ./armv7l.nix
     ./builder.nix
     ./security.nix
     ./sops-nix.nix