MAJOR: add nixpkgs-unstable

WARNING: currently sets allowUnfree since idk how to use allowUnfreePredicate for alternative channels

flake.lock

@@ -128,6 +128,22 @@
         "type": "github"
       }
     },
+    "nixpkgs-unstable": {
+      "locked": {
+        "lastModified": 1753939845,
+        "narHash": "sha256-K2ViRJfdVGE8tpJejs8Qpvvejks1+A4GQej/lBk5y7I=",
+        "owner": "NixOS",
+        "repo": "nixpkgs",
+        "rev": "94def634a20494ee057c76998843c015909d6311",
+        "type": "github"
+      },
+      "original": {
+        "owner": "NixOS",
+        "ref": "nixos-unstable",
+        "repo": "nixpkgs",
+        "type": "github"
+      }
+    },
     "nixpkgs_2": {
       "locked": {
         "lastModified": 1734119587,
@@ -181,7 +197,8 @@
         "ags": "ags",
         "colmena": "colmena",
         "grub2-themes": "grub2-themes",
-        "nixpkgs": "nixpkgs_4"
+        "nixpkgs": "nixpkgs_4",
+        "nixpkgs-unstable": "nixpkgs-unstable"
       }
     },
     "stable": {