chore(dev): add flake and .envrc

.envrc

@@ -0,0 +1 @@
+use flake

.gitignore

@@ -19,3 +19,6 @@
 
 # Go workspace file
 go.work
+
+# direnv
+.direnv

flake.lock

@@ -0,0 +1,98 @@
+{
+  "nodes": {
+    "flake-parts": {
+      "inputs": {
+        "nixpkgs-lib": "nixpkgs-lib"
+      },
+      "locked": {
+        "lastModified": 1704982712,
+        "narHash": "sha256-2Ptt+9h8dczgle2Oo6z5ni5rt/uLMG47UFTR1ry/wgg=",
+        "owner": "hercules-ci",
+        "repo": "flake-parts",
+        "rev": "07f6395285469419cf9d078f59b5b49993198c00",
+        "type": "github"
+      },
+      "original": {
+        "id": "flake-parts",
+        "type": "indirect"
+      }
+    },
+    "nixpkgs": {
+      "locked": {
+        "lastModified": 1706371002,
+        "narHash": "sha256-dwuorKimqSYgyu8Cw6ncKhyQjUDOyuXoxDTVmAXq88s=",
+        "owner": "NixOS",
+        "repo": "nixpkgs",
+        "rev": "c002c6aa977ad22c60398daaa9be52f2203d0006",
+        "type": "github"
+      },
+      "original": {
+        "owner": "NixOS",
+        "ref": "nixos-unstable",
+        "repo": "nixpkgs",
+        "type": "github"
+      }
+    },
+    "nixpkgs-lib": {
+      "locked": {
+        "dir": "lib",
+        "lastModified": 1703961334,
+        "narHash": "sha256-M1mV/Cq+pgjk0rt6VxoyyD+O8cOUiai8t9Q6Yyq4noY=",
+        "owner": "NixOS",
+        "repo": "nixpkgs",
+        "rev": "b0d36bd0a420ecee3bc916c91886caca87c894e9",
+        "type": "github"
+      },
+      "original": {
+        "dir": "lib",
+        "owner": "NixOS",
+        "ref": "nixos-unstable",
+        "repo": "nixpkgs",
+        "type": "github"
+      }
+    },
+    "nixpkgs_2": {
+      "locked": {
+        "lastModified": 1705856552,
+        "narHash": "sha256-JXfnuEf5Yd6bhMs/uvM67/joxYKoysyE3M2k6T3eWbg=",
+        "owner": "nixos",
+        "repo": "nixpkgs",
+        "rev": "612f97239e2cc474c13c9dafa0df378058c5ad8d",
+        "type": "github"
+      },
+      "original": {
+        "owner": "nixos",
+        "ref": "nixos-unstable",
+        "repo": "nixpkgs",
+        "type": "github"
+      }
+    },
+    "root": {
+      "inputs": {
+        "flake-parts": "flake-parts",
+        "nixpkgs": "nixpkgs",
+        "treefmt-nix": "treefmt-nix"
+      }
+    },
+    "treefmt-nix": {
+      "inputs": {
+        "nixpkgs": "nixpkgs_2"
+      },
+      "locked": {
+        "lastModified": 1706462057,
+        "narHash": "sha256-7dG1D4iqqt0bEbBqUWk6lZiSqqwwAO0Hd1L5opVyhNM=",
+        "owner": "numtide",
+        "repo": "treefmt-nix",
+        "rev": "c6153c2a3ff4c38d231e3ae99af29b87f1df5901",
+        "type": "github"
+      },
+      "original": {
+        "owner": "numtide",
+        "repo": "treefmt-nix",
+        "type": "github"
+      }
+    }
+  },
+  "root": "root",
+  "version": 7
+}

flake.nix

@@ -0,0 +1,36 @@
+{
+  description = "URL shortener written in Go";
+
+  inputs = {
+    nixpkgs.url = "github:NixOS/nixpkgs/nixos-unstable";
+
+    treefmt-nix.url = "github:numtide/treefmt-nix";
+  };
+
+  outputs = inputs @ {flake-parts, ...}:
+    flake-parts.lib.mkFlake {inherit inputs;} ({...}: {
+      imports = [
+        inputs.treefmt-nix.flakeModule
+      ];
+      systems = ["x86_64-linux" "aarch64-linux" "aarch64-darwin" "x86_64-darwin"];
+
+      perSystem = {pkgs, ...}: {
+        treefmt = {
+          projectRootFile = ".git/config";
+          programs = {
+            alejandra.enable = true;
+            deadnix.enable = true;
+            gofumpt.enable = true;
+          };
+        };
+
+        devShells.default = pkgs.mkShell {
+          buildInputs = with pkgs; [
+            # Go tools
+            go
+            gopls
+          ];
+        };
+      };
+    });
+}