Properly export all packages for CI builds

We now properly handle deeply merging attributes, allowing us to export both the home-manager configuration and other packages.

This additionally modifies `./pkgs/default.nix` to take a single argument, `pkgs`.

flake.lock

@@ -55,11 +55,11 @@
         ]
       },
       "locked": {
-        "lastModified": 1727383923,
-        "narHash": "sha256-4/vacp3CwdGoPf8U4e/N8OsGYtO09WTcQK5FqYfJbKs=",
+        "lastModified": 1728337164,
+        "narHash": "sha256-VdRTjJFyq4Q9U7Z/UoC2Q5jK8vSo6E86lHc2OanXtvc=",
         "owner": "nix-community",
         "repo": "home-manager",
-        "rev": "ffe2d07e771580a005e675108212597e5b367d2d",
+        "rev": "038630363e7de57c36c417fd2f5d7c14773403e4",
         "type": "github"
       },
       "original": {
@@ -90,11 +90,11 @@
         ]
       },
       "locked": {
-        "lastModified": 1727707210,
-        "narHash": "sha256-8XZp5XO2FC6INZEZ2WlwErtvFVpl45ACn8CJ2hfTA0Y=",
+        "lastModified": 1727999297,
+        "narHash": "sha256-LTJuQPCsSItZ/8TieFeP30iY+uaLoD0mT0tAj1gLeyQ=",
         "owner": "LnL7",
         "repo": "nix-darwin",
-        "rev": "f61d5f2051a387a15817007220e9fb3bbead57b3",
+        "rev": "8c8388ade72e58efdeae71b4cbb79e872c23a56b",
         "type": "github"
       },
       "original": {
@@ -105,11 +105,11 @@
     },
     "nixpkgs": {
       "locked": {
-        "lastModified": 1727634051,
-        "narHash": "sha256-S5kVU7U82LfpEukbn/ihcyNt2+EvG7Z5unsKW9H/yFA=",
+        "lastModified": 1728018373,
+        "narHash": "sha256-NOiTvBbRLIOe5F6RbHaAh6++BNjsb149fGZd1T4+KBg=",
         "owner": "nixos",
         "repo": "nixpkgs",
-        "rev": "06cf0e1da4208d3766d898b7fdab6513366d45b9",
+        "rev": "bc947f541ae55e999ffdb4013441347d83b00feb",
         "type": "github"
       },
       "original": {