Add Nix flakes detritus so I can test this locally

Signed-off-by: Xe <[email protected]>

Author: Xe Iaso

.envrc

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+use flake

.gitignore

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+result
+.direnv

flake.lock

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+{
+  description = "A basic Go web server setup";
+
+  inputs = {
+    nixpkgs.url = "nixpkgs/nixos-unstable";
+    utils.url = "github:numtide/flake-utils";
+  };
+
+  outputs = { self, nixpkgs, utils }:
+    utils.lib.eachSystem [
+      "x86_64-linux"
+      "aarch64-linux"
+      "x86_64-darwin"
+      "aarch64-darwin"
+    ] (system:
+      let
+        pkgs =
+          import nixpkgs {
+            inherit system;
+            overlays = [
+              (final: prev: {
+                go = prev.go_1_19;
+                buildGoModule = prev.buildGo119Module;
+              })
+            ];
+          };
+      in {
+        devShells.default = pkgs.mkShell {
+          buildInputs = with pkgs; [ go gopls gotools go-tools ];
+        };
+      });
+}