flake: add stable channel

flake.lock

@@ -694,6 +694,7 @@
         "private": "private",
         "quick-nix-registry": "quick-nix-registry",
         "rust-overlay": "rust-overlay",
+        "stable": "stable",
         "universe-cli": "universe-cli"
       }
     },
@@ -767,6 +768,22 @@
         "type": "github"
       }
     },
+    "stable": {
+      "locked": {
+        "lastModified": 1694048570,
+        "narHash": "sha256-PEQptwFCVaJ+jLFJgrZll2shQ9VI/7xVhrCYkJo8iIw=",
+        "owner": "NixOS",
+        "repo": "nixpkgs",
+        "rev": "4f77ea639305f1de0a14d9d41eef83313360638c",
+        "type": "github"
+      },
+      "original": {
+        "owner": "NixOS",
+        "ref": "nixos-23.05",
+        "repo": "nixpkgs",
+        "type": "github"
+      }
+    },
     "systems": {
       "locked": {
         "lastModified": 1681028828,

flake.nix

@@ -6,6 +6,7 @@
     nixpkgs.url = "github:NixOS/nixpkgs/nixos-unstable";
     latest.url = "github:nixos/nixpkgs";
     fork.url = "github:Infinidoge/nixpkgs/combined/all";
+    stable.url = "github:NixOS/nixpkgs/nixos-23.05";
 
     # configuration components
     private.url = "git+ssh://git@github.com/Infinidoge/universe-private";

overlays/overrides.nix

@@ -4,6 +4,7 @@ let
 
   latest = mkPkgs inputs.latest;
   fork = mkPkgs inputs.fork;
+  stable = mkPkgs inputs.stable;
 in
 {
   inherit (latest)
@@ -11,4 +12,7 @@ in
 
   inherit (fork)
     ;
+
+  inherit (stable)
+    ;
 }