build(flake): follow monorepo nixpkgs

flake.lock

@@ -404,6 +404,21 @@
         "type": "github"
       }
     },
+    "monorepo": {
+      "inputs": {
+        "nixpkgs": "nixpkgs_2"
+      },
+      "locked": {
+        "lastModified": 1788059616,
+        "narHash": "sha256-HBYT3h0vXRsvmgPOhUW3kgPTkgdl73PEwRTJQ5X48aM=",
+        "path": "/home/alexion/dev",
+        "type": "path"
+      },
+      "original": {
+        "path": "/home/alexion/dev",
+        "type": "path"
+      }
+    },
     "nixos-hardware": {
       "inputs": {
         "nixpkgs": [
@@ -542,8 +557,12 @@
         "firefox-addons": "firefox-addons",
         "gitea-axi": "gitea-axi",
         "home-manager": "home-manager_3",
+        "monorepo": "monorepo",
         "nixos-hardware": "nixos-hardware",
-        "nixpkgs": "nixpkgs_2",
+        "nixpkgs": [
+          "monorepo",
+          "nixpkgs"
+        ],
         "nixpkgs-stable": "nixpkgs-stable",
         "nixpkgs-unstable": "nixpkgs-unstable",
         "nixvim": "nixvim",

flake.nix

@@ -2,8 +2,10 @@
   description = "Alexion's NixOS configuration — one flake for every host";
 
   inputs = {
-    # Base channel.
-    nixpkgs.url = "github:nixos/nixpkgs/nixos-unstable";
+    monorepo.url = "path:/home/alexion/dev";
+
+    # Base package set shared with the monorepo.
+    nixpkgs.follows = "monorepo/nixpkgs";
 
     # Fresher packages, reachable per-package as `unstable.<name>`.
     nixpkgs-unstable.url = "github:nixos/nixpkgs/nixpkgs-unstable";