Add custom flake

flake.lock

@@ -0,0 +1,24 @@
+{
+  "nodes": {
+    "nixpkgs": {
+      "locked": {
+        "lastModified": 1714409183,
+        "narHash": "sha256-Wacm/DrzLD7mjFGnSxxyGkJgg2unU/dNdNgdngBH+RU=",
+        "path": "/nix/store/xpzmrd7qla29lv913dgg0rma1g335zam-source",
+        "rev": "576ecd43d3b864966b4423a853412d6177775e8b",
+        "type": "path"
+      },
+      "original": {
+        "id": "nixpkgs",
+        "type": "indirect"
+      }
+    },
+    "root": {
+      "inputs": {
+        "nixpkgs": "nixpkgs"
+      }
+    }
+  },
+  "root": "root",
+  "version": 7
+}

flake.nix

@@ -0,0 +1,17 @@
+{
+  description = "A very basic flake";
+
+  outputs = {
+    self,
+    nixpkgs,
+  }: let
+    pkgs = nixpkgs.legacyPackages.x86_64-linux;
+  in {
+    packages.x86_64-linux.tree = nixpkgs.legacyPackages.x86_64-linux.tree;
+
+    defaultPackage.x86_64-linux = self.packages.x86_64-linux.tree;
+
+    hydraJobs."tester2" = self.defaultPackage;
+    hydraJobs."tester" = pkgs.neo-cowsay;
+  };
+}