Add Raspberry Pi 4 host

flake.lock

@@ -100,6 +100,21 @@
         "type": "github"
       }
     },
+    "nixos-hardware": {
+      "locked": {
+        "lastModified": 1702453208,
+        "narHash": "sha256-0wRi9SposfE2wHqjuKt8WO2izKB/ASDOV91URunIqgo=",
+        "owner": "NixOS",
+        "repo": "nixos-hardware",
+        "rev": "7763c6fd1f299cb9361ff2abf755ed9619ef01d6",
+        "type": "github"
+      },
+      "original": {
+        "owner": "NixOS",
+        "repo": "nixos-hardware",
+        "type": "github"
+      }
+    },
     "nixpkgs": {
       "locked": {
         "lastModified": 1677676435,
@@ -136,6 +151,7 @@
         "agenix": "agenix",
         "firefox-gnome-theme": "firefox-gnome-theme",
         "home-manager": "home-manager_2",
+        "nixos-hardware": "nixos-hardware",
         "nixpkgs": "nixpkgs_2",
         "secrets": "secrets",
         "thunderbird-gnome-theme": "thunderbird-gnome-theme"