🔨 add nix overlay

flake.lock

@@ -21,11 +21,11 @@
         "systems": "systems"
       },
       "locked": {
-        "lastModified": 1685518550,
-        "narHash": "sha256-o2d0KcvaXzTrPRIo0kOLV0/QXHhDQ5DTi+OxcjO8xqY=",
+        "lastModified": 1689068808,
+        "narHash": "sha256-6ixXo3wt24N/melDWjq70UuHQLxGV8jZvooRanIHXw0=",
         "owner": "numtide",
         "repo": "flake-utils",
-        "rev": "a1720a10a6cfe8234c0e93907ffe81be440f4cef",
+        "rev": "919d646de7be200f3bf08cb76ae1f09402b6f9b4",
         "type": "github"
       },
       "original": {
@@ -36,16 +36,16 @@
     },
     "nixpkgs": {
       "locked": {
-        "lastModified": 1686186443,
-        "narHash": "sha256-Cdz0cYVvS3n2YhyJBgPznIDjsuRyX0OBXkDH3dU/Eo8=",
+        "lastModified": 1690370995,
+        "narHash": "sha256-9z//23jGegLJrf3ITStLwVf715O39dq5u48Kr/XW14U=",
         "owner": "nixos",
         "repo": "nixpkgs",
-        "rev": "59fcfbea18ef091907a114ed41ccba6fc926994a",
+        "rev": "f3fbbc36b4e179a5985b9ab12624e9dfe7989341",
         "type": "github"
       },
       "original": {
         "owner": "nixos",
-        "ref": "release-23.05",
+        "ref": "nixos-23.05",
         "repo": "nixpkgs",
         "type": "github"
       }

flake.nix

@@ -2,7 +2,7 @@
   description = "Manage tmux for what you work on.";
 
   inputs = {
-    nixpkgs.url = "github:nixos/nixpkgs/release-23.05";
+    nixpkgs.url = "github:nixos/nixpkgs/nixos-23.05";
     flake-utils.url = "github:numtide/flake-utils";
     flake-compat = {
       url = "github:edolstra/flake-compat";
@@ -11,7 +11,11 @@
   };
 
   outputs = { self, nixpkgs, flake-utils, ... }:
-    flake-utils.lib.eachDefaultSystem (system:
+    {
+      overlays.default = final: prev: {
+        inherit (self.packages.${prev.system}) workon;
+      };
+    } // flake-utils.lib.eachDefaultSystem (system:
       let pkgs = nixpkgs.legacyPackages.${system};
       in
       {